Smart TV technician helping fix TV Wi-Fi connection issues

Steve H.

Expert ★★★★★ 27,853 satisfied customers

Specialities: Smart TVs & streaming, Wi-Fi & Ethernet, mesh systems, router firmware, DNS/DHCP, Samsung/LG/Roku/Android/Fire TV

Smart TV keeps disconnecting after firmware update — Wi-Fi, Ethernet, router and app issues

Technician avatar Technician
Hey! We’ll track down why your Smart TV is losing connection after an update and get streaming stable again. A few quick questions so we don’t guess:
• Brand/model of the TV (Samsung Smart TV, LG webOS, Sony/Philips Android TV, Hisense/Vizio, Roku TV, Fire TV, etc.)?
• Are you using Wi-Fi or Ethernet when it drops? If Wi-Fi, is it a single SSID, separate 2.4/5 GHz, or mesh?
• What exactly updated: TV firmware/software, router or mesh firmware, or both around the same time?
• Symptoms: TV says “Not connected” or “Network disconnected”, apps like Netflix/YouTube buffer or show “Check your internet”, or the TV keeps forgetting the Wi-Fi password?
The more detail we get, the easier it is to fix a Smart TV that keeps disconnecting from Wi-Fi after an update instead of rebooting randomly.
Customer
After the last software update my Samsung Smart TV keeps dropping the Wi-Fi. It will connect, stream for a bit, then says “Network disconnected” or “No internet connection”. Other devices on the same router are fine. Restarting the TV and router helps only for a while then the Smart TV loses connection again.
Technician avatar Technician
Got it — that’s a textbook Smart TV losing Wi-Fi after a firmware update.
A few things usually change when updates install:
• TV firmware can corrupt or reset the saved wireless network profile, so the Smart TV “half remembers” the network and keeps dropping.
• Router or mesh updates may enable WPA3-only security, band steering, new channels or power-saving that older TV Wi-Fi chips don’t like.
• DHCP/DNS tweaks mean the TV loses its IP address while phones and laptops stay online, so apps show “Connected to Wi-Fi, no internet”.

We’ll do a proper full diagnostic:
1) Clean restart of TV, router and modem.
2) Completely forget and re-join Wi-Fi on the Smart TV so we clear a bad profile.
3) Check router wireless security and band settings that cause TVs to disconnect after updates.
If needed, we’ll also test Ethernet and reset just the TV’s network settings before considering a full factory reset.
Customer
It’s a mesh Wi-Fi with one network name. The TV shows full bars sometimes, then Netflix buffers and I get “Network error”. After this update it also occasionally says the Wi-Fi password is wrong even though I didn’t change it. Other devices never lose internet. How do I make the Smart TV stay connected to Wi-Fi?
Technician avatar Technician
Mesh plus a recent update explains a lot — Smart TVs can be picky about roaming and band steering.
Step 1 — Clean restart of Smart TV, router and modem
1) Turn the TV off, unplug it for 30 seconds, then plug it back in (on some models, hold the power button on the remote until the logo appears to do a “soft reset”).
2) Unplug your router and modem for 30 seconds, then plug them back in and wait until Wi-Fi is fully up and stable.
3) Turn the TV back on, wait on the Home screen for a minute, then try an app.

This simple restart fixes many cases of a Smart TV losing connection after an update. If the disconnects return, we’ll assume the saved Wi-Fi profile is damaged and refresh it next.
Customer
I’ve power-cycled everything a few times. It always comes back but later in the day the Smart TV disconnects from the internet again. Sometimes the network list disappears for a moment. So I think you’re right, the Wi-Fi settings on the TV got messed up by the update.
Technician avatar Technician
Perfect, let’s give the TV a completely fresh network profile.
Step 2 — Forget and re-add the Wi-Fi network on your Smart TV
• On Samsung: Settings > General > Network > Network Settings (or “Open Network Settings”) → Wireless → highlight your Wi-Fi → choose Forget or “Disconnect”, then reconnect and re-enter the password.
• On LG webOS: Settings > Network > Wi-Fi Connection → three dots or “Advanced” → Forget network → join again.
• On Roku TV/Android/Fire TV there is a similar “Forget” option in Network settings.

When reconnected, check network details on the TV:
• It should have a valid IP (not 169.254.x.x), subnet and gateway.
• DNS should be your router or well-known DNS (ISP, 1.1.1.1, 8.8.8.8).

A corrupted profile is one of the most common reasons for a Smart TV not staying connected to Wi-Fi after an update.
Customer
I can forget and reconnect. Do I need to change anything on the router too? I’ve seen posts about Smart TVs not liking WPA3 or certain mesh options — maybe that’s why it keeps dropping the connection.
Technician avatar Technician
Great question — a lot of Smart TV Wi-Fi problems after updates are really router settings.
Step 3 — Tweak router/mesh settings your Smart TV may dislike
In your router or mesh app:
• Security mode: avoid WPA3-only for older Smart TVs. Use WPA2-PSK or WPA2/WPA3 “Transitional”.
• Band steering / Smart Connect: if the TV is bouncing between 2.4 and 5 GHz, try turning this off or create a dedicated SSID for the band the TV uses most.
• Client/SSID isolation: disable on your main network so the TV can see the internet and other devices (phones for casting, etc.).
• Check DHCP lease time and ensure the TV isn’t being blocked by MAC filtering or parental controls.

After saving, reboot the router once. This alone often stops a Smart TV from disconnecting from Wi-Fi after a router or TV software update.
Customer
I also tried an Ethernet cable once, but even then some apps gave “no internet” after a while. The network test on the TV passes sometimes and fails other times. Could network settings on the TV itself be corrupted from the update?
Technician avatar Technician
Yes — if both Wi-Fi and Ethernet are flaky, the TV’s own network stack may be confused.
Step 4 — Test Ethernet properly
• Use a known-good Ethernet cable directly from router to TV (no powerline or switches if possible).
• On the TV, run the built-in Network Test / Check Connection and then stream from at least two apps for 10–15 minutes.
• If Ethernet is stable but Wi-Fi is not, it points back to wireless settings or interference.

Step 5 — Reset network settings on the Smart TV
• Samsung: Settings > General > Network > Reset Network → confirm, then set Wi-Fi up again.
• LG: Settings > Network > Advanced Wi-Fi Settings → “Edit”/“Reset” connection options, then re-add Wi-Fi.
• Roku TV: Settings > System > Advanced system settings > Network connection reset, then reconnect.
This wipes only network configuration and often fixes Smart TVs losing internet connection after an update.
Customer
Most of the time the issue shows up with 4K streaming. The picture goes blocky, then the app says “no internet” even though other devices are fine. Could it just be weak Wi-Fi or interference near the TV since the update?
Technician avatar Technician
4K absolutely exposes weak or unstable Wi-Fi.
Step 6 — Check signal strength and Wi-Fi band for the Smart TV
• In Network Status/Details on the TV, look for signal bars or quality. Anything less than “Good” can cause buffering and disconnects.
• If you’re far from the router on 5 GHz, try either moving the router/mesh node closer or connecting the TV to 2.4 GHz for better range (even if speeds are lower).
• Avoid hiding the TV in a metal cabinet or behind thick walls where the Smart TV keeps disconnecting from Wi-Fi due to interference.

If your router allows it:
• Create a dedicated SSID for the TV (for example Home_TV_5G) so it doesn’t fight with phones and consoles.
• Give the TV a DHCP reservation so its IP doesn’t keep changing — this helps with casting and app authentication too.
These tweaks stabilise many Smart TV connection problems after firmware updates.
Customer
If it still acts up even after resetting the network, what’s next? Do I need to factory reset the Smart TV after the update, or is that overkill for Wi-Fi issues?
Technician avatar Technician
A factory reset is the “big hammer”, but sometimes it’s what finally fixes a Smart TV losing connection after update.
Step 7 — Update apps/firmware, then consider a full reset
• First, check for any additional TV firmware or software updates released after the one that caused issues — vendors often patch Wi-Fi bugs quickly.
• Update your streaming apps from the TV’s app store as well.

If it still keeps dropping:
• Samsung: Settings > General > Reset (PIN may be 0000) and set the TV up again from scratch.
• LG: Settings > General > Reset to Initial Settings.
• Roku/Android/Fire TV have similar “Factory reset” options in System settings.

After a reset, join Wi-Fi or Ethernet and test with one or two apps before signing in everywhere. If the Smart TV still disconnects from the internet even on Ethernet after a full reset, we start to suspect a hardware fault or a specific firmware bug for that model.
Customer
After forgetting the Wi-Fi, resetting the TV network settings and changing the router to WPA2 with less aggressive band steering, it’s been stable all evening. No more “Network disconnected” messages and 4K streams are fine. Looks like that fixed my Smart TV losing connection after update.
Technician avatar Technician
Summary: when a Smart TV keeps disconnecting from Wi-Fi after an update, restart the TV, router and modem once, then forget and re-join your Wi-Fi network on the TV. Use WPA2 or WPA2/WPA3 Transitional, calm down band steering, and give the TV a reserved IP. Reset only network settings before a full factory reset, and test Ethernet to rule out pure Wi-Fi issues. Not sure which menu or router option to tap? Open the chat and an expert will walk you through it live.

Quick answer: the accepted fix

Accepted fix when a Smart TV loses connection after an update: restart the TV, router and modem once, then on the TV go to Network settings, select your Wi-Fi and choose Forget or “Reset network”, then re-join with the correct password. In your router, use WPA2 or WPA2/WPA3 Transitional instead of WPA3-only, and reduce aggressive band steering on mesh systems. Give the TV a reserved IP and, if needed, run the TV’s built-in Reset Network option before considering a full factory reset of the Smart TV.

Why Smart TVs disconnect after a software or router update

Most Smart TV connection problems after an update come down to a handful of changes. A TV firmware or webOS/tizen/Android TV update can corrupt the saved Wi-Fi network, alter power-saving behaviour, or change how the TV handles DNS and DHCP. Router and mesh updates may switch to WPA3-only security, change Wi-Fi channels, or apply new band-steering rules that cause the Smart TV to keep losing Wi-Fi while other devices stay online. In busy apartment buildings, small changes in 5 GHz channel or transmit power can turn a previously “Excellent” signal into one that drops whenever you try to stream 4K or HDR content.

How to test if your Smart TV connection is really fixed

After you’ve made changes, don’t just open one app once. To confirm a Smart TV losing internet after an update is truly fixed, run the TV’s built-in Network Test / Check Connection and make sure both “Network” and “Internet” show OK. Then stream from at least two different apps (for example Netflix and YouTube) for 20–30 minutes, watching for buffering or “Network disconnected” messages. Turn the TV off, leave it in standby for a few hours, then power it back on and check if it wakes up still connected to Wi-Fi. If it survives streaming, app switches and wake-from-sleep without errors, your Smart TV network and router settings are likely good; if not, it’s time to look deeper at interference, Ethernet, or a full reset.

Smart TV losing connection — quick troubleshooting tips

Most cases are fixed by refreshing the TV’s network profile and aligning router settings with what Smart TVs expect.

Quick path: restart the Smart TV, router and modem, then forget and reconnect your Wi-Fi network on the TV. Keep router security on WPA2 or WPA2/WPA3 Transitional, avoid changing the Wi-Fi name/password too often, and give the TV a reserved IP if possible. If the Smart TV still keeps disconnecting from Wi-Fi after an update, run a Network reset from the TV’s settings, test Ethernet for stability, and only then consider a full factory reset. Document the TV model, firmware version and any error codes before contacting manufacturer support or an expert.

Disclaimer: This information is AI-generated and intended for general guidance only. For advice specific to your Smart TV brand, router model, and firmware versions, please consult a verified expert on Whizz-Tech before making decisions.

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FAQ

Why did my Smart TV start losing connection right after an update?

Updates can change Smart TV network settings, reset the Wi-Fi profile, or expose router issues. Your TV may suddenly dislike new WPA3-only security, aggressive band steering, or a corrupted saved network, causing random disconnects and “Network error” messages even while other devices stay online.

How do I fix a Smart TV that won’t stay connected to Wi-Fi?

Restart the TV, router and modem, then go into the TV’s Network settings, forget your Wi-Fi and join it again with the correct password. Use WPA2 or mixed WPA2/WPA3 on the router, avoid renaming your SSID repeatedly, and, if possible, reserve an IP address for the TV so it doesn’t keep grabbing a new one.

Should I use 2.4 GHz or 5 GHz Wi-Fi for a Smart TV?

5 GHz usually gives higher speeds and is better for 4K streaming, but 2.4 GHz travels farther through walls. If your Smart TV is far from the router or keeps dropping on 5 GHz, try moving a mesh node closer, using a dedicated 5 GHz SSID, or connecting to a strong 2.4 GHz signal instead.

When should I reset or restore my Smart TV for Wi-Fi problems?

If restarting, forgetting Wi-Fi and adjusting router settings don’t stop frequent Smart TV disconnects after an update, reset only the TV’s network settings first. If problems continue on both Wi-Fi and Ethernet, a full factory reset is the next step; if that fails, contact the TV manufacturer or an expert to check for known firmware bugs or hardware issues.

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