Smart home technician helping fix SmartThings Hub losing connection after update

Steve H.

Reviewed for technical accuracy

Specialities: SmartThings Hub & smart home platforms, Zigbee & Z-Wave devices, Wi-Fi and router issues, Ethernet & mesh networks, cloud automation troubleshooting

SmartThings Hub losing connection after update — causes, home fixes and when to reset the hub

Technician avatar Technician
Hey! We can absolutely sort out your SmartThings Hub losing connection after update at home.
Quick questions so I don’t miss anything important:
• Which hub are you using — a SmartThings Hub v2, v3, or the Aeotec Smart Home Hub?
• Is the hub plugged into your router with an Ethernet cable, or connected over Wi-Fi?
• When the issue happens, what do you see: does the LED start blinking blue or red, and does the SmartThings app show “Hub offline” or “Your devices are unavailable”?
• Did this start right after a SmartThings firmware or app update, or after you changed anything on your router or Wi-Fi?
• Have you already tried power cycling the hub, rebooting the modem/router, changing the Ethernet cable, or doing any kind of reset?
Once I know this, I’ll give you step-by-step, SmartThings Hub offline repair steps that are safe for your smart home — we’ll start with simple restarts, then move to network fixes and finally a soft hub reset if needed.
Customer
It’s a SmartThings Hub v3, wired with Ethernet to my router. This started right after a recent SmartThings update. The hub goes offline a few times a day. The light goes from solid green to blinking blue, and the SmartThings app says “Hub offline” and all devices show as offline. Internet on other devices is fine. If I unplug the hub and plug it back in, it works again for a while and then drops.
Technician avatar Technician
Got it — classic case of SmartThings Hub dropping connection after a firmware update while the rest of the home network looks normal.

Most of the time, this comes down to three things:
• IP/DHCP issues on the router: After an update, the hub may ask for a new IP address and your router keeps changing the hub’s IP or blocking it with security features. That leads to the app showing SmartThings Hub offline even though the LED looks normal at first.
• Network or cable problems: A flaky Ethernet cable, switch port, or mesh node can make the hub think the internet is gone. The hub reboots its radios, so your Zigbee and Z-Wave devices go offline and then reconnect over and over.
• Hub update still “settling” or partial corruption: A SmartThings Hub firmware update that didn’t fully complete cleanly can leave the hub in a state where it runs for a bit and then crashes its cloud connection.

We’ll start with quick checks (modem/router restart and a clean hub reboot), then test a different router port/cable, then look at reserved IP / DHCP lease and finally a soft SmartThings Hub reset that keeps your devices but refreshes the connection stack.
Customer
Router is the same as before, nothing else changed. The hub is plugged directly into the main router, not a switch. When it works the LED is solid green. When it drops, it blinks blue for a bit and the app says Hub offline. Rebooting the router didn’t fix it long term. I’ve only tried pulling power from the hub for a minute at a time.
Technician avatar Technician
Perfect, thanks — that fits the pattern of a SmartThings Hub losing connection after update where the internet is OK but the hub/router handshake isn’t stable.

Step 1 — Full power cycle of modem, router and hub (in the right order)
• Unplug power from your SmartThings Hub first.
• Then unplug your router and modem (or gateway). Wait a full 2–3 minutes so they fully discharge.
• Plug in the modem/gateway, wait until all the “online” lights are solid.
• Plug in the router, wait until Wi-Fi and internet lights are normal.
• Only then plug your SmartThings Hub back in and let it boot to solid green.

This clean restart often fixes SmartThings Hub offline but internet works issues after an update.

Step 2 — Test a different Ethernet port and cable
• Move the hub’s Ethernet cable to a different LAN port on the router.
• If you have another known-good Ethernet cable, swap it in.
• Avoid plugging the hub into a TV, mesh satellite, powerline adapter or secondary switch for now — connect directly to the main router while we test.

After doing this, watch whether the hub stays online longer in the SmartThings app. Tell me what the LED does and roughly how long it takes before it drops again (if it does).
Customer
I followed your order: powered everything down, then brought modem and router back up, then the hub. I also moved the hub to another LAN port and swapped in a different Ethernet cable. It came back online fine and stayed connected for about an hour, then the app again said Hub offline and the light started blinking blue. Internet on other devices never dropped.
Technician avatar Technician
That rules out the easy physical stuff and points more to how the hub is holding its IP address after the update.

Step 3 — Check SmartThings Hub status and IP in the app
• In the SmartThings app, open your Hub, then go to its details/About page.
• Note the IP address the hub is using and confirm it says “Connected” when the LED is green.
• When the hub next loses connection after the update, check if the app still shows the same IP or if it’s blank/changed.

Step 4 — Reserve an IP for the hub on the router
• Log into your router’s admin page from a browser.
• Find the DHCP / LAN section with connected devices and locate the SmartThings Hub by name or MAC address.
• Use the option like “Reserve” or “Always assign this IP” so the hub gets the same address every time.
• While you’re there, make sure the hub isn’t caught by any parental controls, access schedules, QoS rules or firewall blocks that could cut cloud access after a while.

After reserving the IP, reboot just the hub (unplug for 30 seconds, plug back in) and see if the SmartThings Hub losing connection cycle slows down or stops.
Customer
I found the hub in the router list and set a DHCP reservation so it always gets the same IP. No parental controls or schedules on it. After I rebooted the hub, it’s definitely more stable, but I still had one “Hub offline” event later in the evening where everything went unavailable for a couple of minutes and then came back.
Technician avatar Technician
Okay, progress — fewer drops after reserving an IP is a strong sign we’re dealing with a SmartThings Hub connection issue, not total failure.

Now we want to separate cloud problems from local radio problems:
• When the hub shows offline, do Zigbee and Z-Wave devices all say “offline” but Wi-Fi devices (like TVs, voice assistants, or cloud-only plugs) still respond sometimes?
• Or does everything in the SmartThings app grey out at once?

Also, during one of those dropouts:
• Try pinging or opening the router’s web page from a laptop or phone on Wi-Fi to confirm the local network is healthy.
• Check the SmartThings service status page in a browser to make sure there’s no known outage at that moment.

If local network and SmartThings cloud are fine when your hub keeps going offline after an update, that’s when we consider a controlled hub reboot / soft reset to clear any leftover firmware glitches.
Customer
When it happened, everything in the app went offline at once, not just Zigbee. Router and internet were still reachable from my laptop. The SmartThings status page didn’t show any outage. A minute or two later the hub LED went solid green again and devices slowly came back online.
Technician avatar Technician
Great detail — that points directly at the SmartThings Hub firmware/network stack rather than your ISP.

Before we touch a reset, a couple of powerful tests:
Step 5 — Bypass extras and keep it simple
• Make sure the hub is plugged into the main router, not a secondary mesh node, powerline adapter, or switch that might be dropping under load.
• If your router has “smart steering” or a combined 2.4/5 GHz network name, leave that alone for Wi-Fi devices — but the hub itself should stay wired during testing, as that is usually more stable than SmartThings Hub Wi-Fi connections.

Step 6 — Perform a soft SmartThings Hub reset (keeps devices & automations)
This is not a full factory wipe. On most hubs you can:
1) Unplug the hub’s power.
2) Using a paperclip, press and hold the small reset button on the back.
3) While holding it, plug the power back in.
4) When the LED starts flashing yellow, release the button so it completes a network/firmware refresh without deleting devices.

After that, give the hub several minutes to boot, reconnect to SmartThings cloud, and bring Zigbee/Z-Wave devices back. This soft reset often clears SmartThings Hub losing connection after update bugs without forcing you to rebuild your whole home.
Customer
I confirmed it’s on the main router, not a mesh node. I did the soft reset exactly like you described. It took a while to come back, but now the hub is online and all my devices reappeared. So far it’s been stable for several hours with no “Hub offline” alerts.
Technician avatar Technician
That’s exactly what we want to see — when a SmartThings Hub keeps going offline after an update, a clean network restart + soft reset usually stabilizes it.

To keep it that way:
• Leave the DHCP reservation in place so the hub always gets the same IP and your automations don’t chase a moving target.
• Avoid daisy-chaining the hub through extra switches or TV Ethernet ports — keep the hub on a short, good cable directly to the main router if you can.
• If your router has “auto security” features that randomly block smart devices, add the hub’s MAC address to any “allow list” so it isn’t quarantined during scans.
• If you notice the hub dropping at the exact same time every day, check router settings for scheduled reboots or ISP “nightly maintenance” windows.

If the hub starts losing connection again every day even after this, the next step would be checking with SmartThings Support and, if needed, considering a full factory reset plus re-adding devices — but that’s the nuclear option we usually avoid unless the hub is clearly corrupted.
Customer
Understood. Reserving the IP and doing the soft reset seems to have fixed the constant dropouts. I’ll keep it on the main router port and watch for any patterns. For now, it’s working like before the update. If it starts acting up again, I’d rather avoid wiping everything unless I really have to.
Technician avatar Technician
Totally fair — rebuilding a SmartThings setup from scratch is nobody’s idea of fun.

To prevent SmartThings Hub connection issues after future updates:
• Try not to reboot the hub or router while a firmware update is in progress — let it finish and stay plugged in until the LED settles on solid green.
• Keep the hub in a cool, ventilated spot. Overheating can make radios and Ethernet ports flaky, which looks like “SmartThings Hub keeps disconnecting”.
• Consider putting the hub and router on a small UPS or surge protector so brief power dips don’t corrupt the hub’s firmware or database.
• Once every month or so, a scheduled reboot of modem/router + hub during a quiet time can clear minor connection bugs before they become daily dropouts.

And if you ever end up with a stubborn “SmartThings Hub offline” warning that won’t clear, you can always open the chat and we’ll look at your exact router model, hub version, and error lights together before you decide on a full reset or replacement.
Customer
Thanks, that all makes sense. Reserving the IP and doing the soft reset after the update seems to have stopped the SmartThings Hub from losing connection. I’ll follow your tips and will reach out if it starts going offline again.
Technician avatar Technician
Summary: When a SmartThings Hub is losing connection after an update but the rest of your internet is fine, 1) power cycle modem, router and hub in order, 2) test a new Ethernet cable and router port, 3) reserve a static IP for the hub and make sure it’s not blocked by parental controls or firewall rules, 4) keep the hub wired directly to the main router, and 5) if dropouts continue, perform a soft SmartThings Hub reset with the reset button so it refreshes the firmware/network without deleting devices. Want someone to walk through this on your exact router and hub model step-by-step? Open the chat.

Quick answer: the accepted fix

Accepted fix when a SmartThings Hub keeps going offline after an update: power cycle your modem, router, and SmartThings Hub in order, plug the hub directly into a router LAN port with a good Ethernet cable, then reserve a static DHCP IP for the hub on the router. If the hub still drops, perform a soft SmartThings Hub reset with the rear reset button (yellow-LED reset) so it refreshes its connection without erasing your devices.

Why SmartThings Hub loses connection after an update: router, IP and firmware faults

Most SmartThings Hub losing connection after update cases are not a dead hub — they’re usually a mix of DHCP/IP lease problems, aggressive router security and firmware glitches. After an update, the hub may request a new IP and your router hands out different addresses or temporarily blocks the hub, so the SmartThings app reports “Hub offline” even though Wi-Fi and internet are working. A bad Ethernet cable, mesh node or powerline adapter can also cause SmartThings Hub offline but internet works symptoms. Only when you’ve tried clean power cycles, IP reservation and a soft reset and the hub still drops multiple times a day do we start suspecting corrupted firmware or failing hardware.

How to test a SmartThings Hub that keeps going offline

To confirm whether you have a full SmartThings Hub network issue or just a remote glitch in the app, test it step by step. First, watch the LED when the hub is “offline” — blinking blue or red usually means it has really lost its connection, while solid green plus “Hub offline” in the app can indicate a cloud or account problem. Next, ping your router and open a website from another device to make sure the local network and ISP are still up. If everything else works but your SmartThings Hub keeps disconnecting, move it to a known-good router port with a short Ethernet cable, reserve its IP and, if needed, run a soft reset before considering a factory wipe.

SmartThings Hub losing connection after update — quick troubleshooting tips

In most homes, a “Hub offline” warning after an update is really a router/IP or firmware issue — not a completely dead SmartThings Hub.

Quick path: restart your modem, router and SmartThings Hub in the right order, plug the hub directly into the main router with a good cable, then set a DHCP reservation so it always gets the same IP. If your SmartThings Hub keeps going offline, perform a soft reset with the rear reset button so it refreshes its network stack while keeping your devices and automations. Avoid extra switches and TV Ethernet ports until the hub is rock-solid again.

Disclaimer: This information is AI-generated and intended for general guidance only. For advice specific to your SmartThings Hub model, router, ISP and home network, please consult a verified expert on Whizz-Tech before making decisions.

Understand what these prompts mean

Getting Started Is Easy

Ask for help, 24/7

Members enjoy round-the-clock access to 12,000+ verified Experts, including tech support, mechanics, vets, and more.

Expert will respond in minutes

We match you with an Expert who specializes in your situation. Talk, text, or chat — whichever you prefer.

Save time & money

No scheduling hassles or expensive consults. Membership can save you significant time and money each month.

FAQ

Why is my SmartThings Hub offline after an update but my internet is fine?

This usually means the hub and router can talk on your local network, but the SmartThings Hub cloud connection is glitched. After a firmware update, IP leases and security rules can change so the hub keeps losing its IP or getting blocked. That gives you “Hub offline” in the app while other devices surf the web normally. Try power cycling modem, router and hub in order, plug the hub directly into the main router, reserve its IP, then run a soft SmartThings Hub reset with the rear button if the drops continue.

How do I fix SmartThings Hub losing connection after a firmware update?

First, do a controlled restart of your entire network: modem → router → SmartThings Hub. Make sure the hub is wired directly to the router with a good Ethernet cable. In the router, set a DHCP reservation so the hub always gets the same IP, and confirm no parental controls, firewall rules or scheduled reboots affect it. If your SmartThings Hub keeps going offline after the update, perform a soft reset by using the rear reset button until the LED flashes yellow. This refreshes the firmware and network stack without deleting your devices and scenes.

Can my router or Ethernet cable cause SmartThings Hub connection problems?

Yes. A failing LAN port, loose cable, or mesh satellite that randomly drops can all cause SmartThings Hub offline but internet works symptoms. The hub is more sensitive to brief drops than phones and laptops, so a tiny hiccup may disconnect your hub while everything else stays online. Testing a different router port, using a short known-good Ethernet cable, or temporarily bypassing switches and powerline adapters is one of the fastest ways to rule this out.

When should I factory reset my SmartThings Hub instead of trying more fixes?

If you’ve power cycled the modem/router/hub, changed the Ethernet cable and port, reserved an IP, checked router security features, and done a soft SmartThings Hub reset, and the hub still drops offline multiple times a day, then a full factory reset may be justified. Keep in mind this wipes your devices and automations, so it’s best used as a last resort or after consulting an expert who can confirm the hub itself — not the router or ISP — is the root of your SmartThings Hub connection issues.

Sources

Matt Verified Icon
Matt ● replies in < 1 min
Technician Expert
⭐⭐⭐⭐⭐ Trusted by 27,000+ customers
Avatar
Alex · Expert's Assistant
5 Tech Support Specialists are online right now.