Technician helping fix Tuya not discovering devices in Smart Life app

Steve H.

Expert ★★★★★ 27,853 satisfied customers

Specialities: Smart plug stability after outages, Wi-Fi dropouts and “offline” devices, router reboot order (modem/router/mesh), DHCP/IP conflicts.

Smart plug disconnects after a power outage — common reasons and safe checks (Wi-Fi, DHCP, mesh, firmware)

Technician avatar Technician
Power outages can leave smart plugs “stuck” in a half-connected state — the plug has power again, but the network side didn’t recover cleanly.

Before we change anything, I want to keep this safe and simple. Let’s start with checks that won’t make it worse (no factory resets yet).

A few quick details so we don’t guess:
• Is it a Wi-Fi smart plug or a Thread/Zigbee plug (uses a hub/bridge)?
• Which app do you control it with (brand app, Apple Home, Alexa, Google Home)?
• After power came back, does the plug show Offline / Not responding, or does it connect briefly then drop again?
• What’s your Wi-Fi setup: single router, mesh, extender, or a modem/router combo?
Customer
It’s a Wi-Fi plug. After a power outage last night it came back, but now it keeps going offline in the app. Sometimes it works for a minute, then disconnects again. I have a mesh Wi-Fi system.
Technician avatar Technician
That pattern (briefly online, then drops) is very common on mesh after an outage. Two things often collide:
• the mesh nodes come back in a different order, and the plug latches onto a weak node
• the router hands out a different IP address, and the plug fights to renew it (DHCP “lease” confusion)

One safety note: I don’t want you to keep power-cycling the plug repeatedly while it’s trying to reconnect. That can sometimes make the reconnect loop worse. We’ll do a controlled check instead.

What do you see on the plug itself right now — a steady light, blinking, or no light? And did any other Wi-Fi devices act odd after the outage (printer, camera, TV, speaker)?
Customer
The plug light is steady. Other devices mostly recovered, but one camera also showed offline for a while. The plug is the only thing that keeps dropping now.
Technician avatar Technician
Good — steady light usually means it thinks it’s connected, so we focus on the network path, not the outlet power.

Let’s do the safest “network sanity” check first:
1) In your router/mesh app, can you find the plug in the device list?
2) If you can, does it show a 2.4 GHz connection and a stable signal, or does it bounce between nodes?
3) Do you see its IP address changing frequently?

If checking the device list is uncomfortable, tell me the mesh brand (Eero, Google/Nest WiFi, Deco, Orbi, etc.) and we’ll keep it simple.
Customer
It’s TP-Link Deco. I can see the plug in the list, but it sometimes disappears and comes back. When it’s there, it’s on 2.4 GHz. I noticed the IP address changed since yesterday.
Technician avatar Technician
That points strongly to a DHCP/IP issue after the outage — the plug may be requesting a lease, losing it, then retrying.

Two safe checks (no resets):
• In the Deco app, see if there’s an option for Address Reservation / IP reservation for that plug. We’re not changing Wi-Fi settings — just making sure the plug gets the same local address each time.
• Also check whether the plug is marked as “High Priority” or blocked by a profile (some mesh apps apply limits after an outage or update).

I don’t want you to change a bunch of router settings at once. If we adjust anything, we’ll do one small change and observe.
Customer
I see an option to reserve an IP address for devices. I haven’t used it before. Also, my Wi-Fi name is the same for both bands. Could that matter here?
Technician avatar Technician
Same Wi-Fi name for both bands is usually fine, but after an outage it can expose weak spots: the plug may cling to a far node, or struggle if band steering is aggressive. Since your plug already shows 2.4 GHz when visible, the bigger signal is the IP changing and the device vanishing/reappearing.

Reserving an IP is a gentle change and easy to undo. It doesn’t reconfigure the plug — it just tells the router “when you see this device, always hand it this address.”

Before you do that, one quick question: did your mesh or plug app update recently (even automatically)? Outages + updates can create a timing mismatch, so we should rule that out.
Customer
The Deco app updated a couple of days ago, not sure about the plug app. The outage happened after that. I’m okay trying the IP reservation if it’s safe.
Technician avatar Technician
It’s a safe step, yes. And it matches the symptom you described (device “falls off” and returns with a different address).

After setting the reservation, don’t rush to re-add the plug. Just watch for two things over the next 10–15 minutes:
• Does it stay present in the Deco device list without disappearing?
• Does the plug remain controllable in the app without flipping to “offline”?

If it still drops, the next safest place to look is signal stability: whether the plug is roaming between mesh nodes or sitting on a weak connection.
Customer
I reserved an IP for it. It stayed visible longer, but it still went offline once. When it came back it was connected to a different Deco node. The outlet is in a hallway between two nodes.
Technician avatar Technician
That roaming detail is important. Some smart plugs don’t handle “handoff” between mesh nodes very gracefully — they behave better when they stick to one access point.

Let’s keep this safe and low-effort:
• If your Deco app has a “Connection Preference” / “Bind device to a node” option, see if you can pin the plug to the nearest stable node (not the one it flips away from).
• If there’s no pin option, a simple test is to temporarily move the plug to an outlet closer to one node for a short period, just to confirm whether the disconnect stops. (This is a test, not a permanent fix.)

I’m asking for this because it helps us separate “network roaming” from “plug hardware.”
Customer
I can’t easily move it because it powers a lamp, but I can try another outlet nearby for testing. Also, could this be a firmware issue on the plug itself after the outage?
Technician avatar Technician
It can be, but it’s less common than roaming/DHCP after a power event. Still, we should rule out the low-risk firmware checks:

• In the plug’s app, check whether it shows a pending firmware update (don’t start it mid-troubleshooting if the plug is unstable — just note it).
• If the app offers a “reconnect” or “refresh device” option, use that rather than re-adding the device.
• Make sure your phone isn’t on a VPN while controlling the plug — some apps don’t like local discovery through VPN, even when the internet is fine.

Trust moment: I’m intentionally avoiding anything that wipes schedules or automations unless we’ve confirmed the cause.
Customer
Understood. VPN was on earlier, I turned it off. There is a firmware update available, but I won’t run it yet. I tried a closer outlet for a bit and it stayed online. So it might be the mesh roaming / signal in that hallway.
Technician avatar Technician
That’s a strong clue. If it stays stable near one node but drops in the hallway, you’re likely seeing a “border zone” where the plug keeps switching nodes or living on a weak 2.4 GHz signal.

What you’ve learned (without doing anything risky):
• IP reservation reduced one cause of dropouts (address churn).
• The remaining issue lines up with mesh roaming / signal quality at that outlet.

Next safe checks are all about stability, not speed: keep the plug pinned to one node if your mesh allows it, reduce roaming if there’s a setting for it, and only consider a firmware update once the plug stays connected reliably for a while.

Quick answer: the accepted fix

Accepted first checks for a smart plug that disconnects after a power outage: confirm it’s joining 2.4 GHz, then verify it stays visible in your router/mesh device list without its IP changing repeatedly. If your router supports it, set an IP reservation for the plug to prevent DHCP “lease” churn. On mesh systems, watch whether the plug keeps hopping between nodes; unstable roaming near a hallway/outlet can look like random dropouts. Save firmware updates and factory resets for later — only after the connection is stable enough to complete them safely.

Why a smart plug can start disconnecting after an outage

Most Tuya not discovering devices issues come from onboarding conflicts: pairing on 5 GHz instead of 2.4 GHz, band steering switching networks mid-setup, blocked iOS Local Network permission, VPN/guest Wi-Fi isolation, or choosing the wrong pairing method (EZ Mode vs AP Mode). Another common cause: the product is Bluetooth, BLE Mesh, or Zigbee and needs the correct add flow or a compatible Tuya hub/gateway.

How to tell if it’s Wi-Fi stability, DHCP, or the plug itself

After pairing, test stability: (1) toggle the device (plug/bulb) from the Smart Life app; (2) power-cycle the device once and confirm it reconnects; (3) check the device shows Online after 5–10 minutes. For Wi-Fi devices, if it drops offline, re-check router security (WPA2), 2.4 GHz signal strength, and whether it accidentally joined a guest network. For Bluetooth devices, confirm Bluetooth permissions and range (BLE devices typically need to be nearby unless you use a gateway).

Smart plug disconnecting after a power outage — quick troubleshooting tips

Most cases are fixed by 2.4 GHz Wi-Fi + correct pairing mode + permissions.

Quick path: turn off VPN, allow Smart Life Local Network + Bluetooth permissions, connect your phone to 2.4 GHz, reset the device into the correct pairing state, and try EZ Mode first then AP Mode (device hotspot) if discovery fails. If your device is Bluetooth/Zigbee, use the right category or add a Tuya gateway before expecting discovery.

Disclaimer: This information is AI-generated and intended for general guidance only. Do not open devices or attempt unsafe electrical work. For advice specific to your Tuya/Smart Life device model and router settings, please consult a verified expert on Whizz-Tech or the manufacturer’s support before making decisions.

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FAQ

Why did my smart plug start disconnecting right after a power outage?

A power event can reboot your router, mesh nodes, and the plug in a different order. That can lead to unstable Wi-Fi roaming, a weak 2.4 GHz link, or a DHCP/IP “lease” change that the plug doesn’t handle well. Start with safe checks in the router/mesh app before resetting the plug.

Is this a router issue or a problem with the smart plug?

If the plug stays online when moved closer to a single access point but drops at its usual outlet, it points to signal/roaming. If it drops everywhere and keeps disappearing from the router’s device list, DHCP or compatibility (security settings, isolation) is more likely. Hardware is usually the last suspect after network checks.

Should I reserve an IP address for a smart plug?

On many home networks, IP reservation helps when devices go offline after outages. It prevents the plug from bouncing between different local addresses. It’s a low-risk change that can be undone easily in the router settings.

Can I check this safely at home without factory-resetting anything?

Yes. You can review the plug’s connection in the router/mesh app, confirm it’s on 2.4 GHz, and watch whether it keeps switching nodes or changing IP. You can also do a single controlled reboot of the modem/router and then the plug. Save factory resets and firmware updates for after the connection is stable enough to complete them.

Sources

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