Technician helping fix Tuya not discovering devices in Smart Life app

Steve H.

Expert ★★★★★ 27,853 satisfied customers

Specialities: Home Wi-Fi & mesh troubleshooting, intermittent disconnects, nodes dropping offline, modem/router handoff issues, firmware/app updates.

Common reasons a WiFi mesh goes offline intermittently — and the safest checks to do first

Technician avatar Technician
Hi — let’s handle this calmly and safely. When a WiFi mesh keeps going offline intermittently, it can feel random, but it’s usually one of a few patterns.

Before we change anything, I don’t want you to try steps that could make it worse (like factory resets) unless we have a clear reason.

A few quick details so we know where to look:
• What mesh brand/model (eero, Google/Nest, Orbi, Deco, ASUS, etc.)?
• When did it start — after an update, power outage, new modem, or new ISP plan?
• Does the whole network drop, or just one node/satellite goes offline?
• When it happens, do wired devices (Ethernet) still work, or is internet down everywhere?
Customer
It’s a mesh WiFi with 3 units. The internet works for hours, then one point goes offline and sometimes everything gets slow. It started a couple weeks ago. I’m not sure if there was an update. I didn’t change anything on purpose.
Technician avatar Technician
Thanks — that “one point drops, then the rest struggles” often points to either weak backhaul (how the nodes talk to each other), or a gateway/modem hiccup that the mesh doesn’t recover from cleanly.

Two “safe checks first” questions:
1) Is the main unit (the one connected to the modem) using an Ethernet cable to the modem?
2) When the point goes offline, do you notice any blinking/red light on the main unit or the offline point?
Customer
Yes, the main unit is connected to the modem with an Ethernet cable. When it happens, the point has a red light. The main one usually looks normal, but sometimes the app says the network is offline for a minute.
Technician avatar Technician
That’s helpful. A red light on a point usually means it lost its link — either to the gateway, or to the internet through the gateway.

Let’s rule out the most common “quiet causes” that show up suddenly:

Safe check A — power and placement
• Is the offline point plugged into a power strip that might be loose or switching off?
• Did anything move near it recently (metal cabinet, TV, microwave, thick wall, aquarium)?

Safe check B — heat
• Does the point feel unusually warm when it drops? (Not burning hot — just “too warm for comfort”.)
Customer
It is on a power strip behind the TV stand. And yes, it does feel warm sometimes. I also added a soundbar recently, but that’s about it.
Technician avatar Technician
That combination can matter more than people expect. I’ve seen mesh points go offline intermittently when they’re tucked behind electronics (heat + interference) or when a power strip connection is slightly loose.

I don’t want you crawling around too much — just two gentle tests:
• If possible, plug that point directly into the wall for a day (same location is fine).
• Give it a little breathing room: even moving it 30–60 cm away from the TV/soundbar can help.

Now, another important question that often explains “started two weeks ago”: did your ISP swap the modem, or did you have a short power cut around that time?
Customer
There was a power cut once, yes. The modem restarted. Since then it’s been “mostly fine” but these dropouts keep happening. I’m nervous to change settings.
Technician avatar Technician
Totally fair — we’ll stay away from risky changes. After a power cut, it’s common for devices to come back in a slightly odd order, and mesh systems can behave strangely until the “chain” is clean again.

Safe check C — restart order (no settings changed)
When you’re ready (not right this second), the safest order is:
1) Turn off the modem (unplug power).
2) Turn off the mesh gateway (main unit).
3) Wait a minute, then power the modem back on and let it fully settle.
4) Power the mesh gateway back on, then satellites/points last.

Before you do that, one more question: do you have two routers in the home (for example, an ISP router plus the mesh)?
Customer
I think so. The ISP box has Wi-Fi, and the mesh also has Wi-Fi. I didn’t disable anything. Could that cause random offline issues?
Technician avatar Technician
Yes — and you’re not alone. Having an ISP router broadcasting Wi-Fi while a mesh is also routing can create what people call double NAT or “two networks fighting,” and it can look like intermittent dropouts.

We can check this safely without changing anything:
• In the mesh app, does it say the internet connection type is “Double NAT” or “NAT detected”?
• Are your mesh units connected in router mode or bridge mode (if the app shows it)?

If you’re not sure, just tell me the mesh brand and I’ll translate the wording you see in the app.
Customer
It’s a TP-Link Deco. I see something about “router mode.” I don’t see “double NAT,” but I haven’t looked deeply. Also, sometimes the Deco app shows a unit as offline even when Wi-Fi seems to work.
Technician avatar Technician
That “app says offline but Wi-Fi still works” is a real thing — it can be a reporting/app sync issue, or it can mean the unit is briefly losing its link and recovering on its own.

Let’s separate “real outage” from “false alarm” with two simple checks the next time it happens (no tools needed):
1) On a phone or computer, can you open a normal website (like a news site) while the app shows offline?
2) If you can, is it only on Wi-Fi, or does it also fail on cellular/hotspot?

Also: are your Decos connected using Ethernet backhaul (wired between units), or wireless only?
Customer
Wireless only. When it happens, websites sometimes load slowly or not at all on Wi-Fi. If I turn off Wi-Fi and use cellular, it works. Then a few minutes later Wi-Fi comes back.
Technician avatar Technician
That sounds like a real Wi-Fi/backhaul drop (not just the app). With wireless-only mesh, the most common reasons are:

• The “offline” unit is too far away or blocked, so it keeps losing the backhaul link.
• A nearby source of interference (TV stand electronics, microwave, thick wall) causes brief disconnects.
• The gateway Deco is losing internet from the modem for short periods, and the mesh takes time to recover.

One safe test that often reveals the cause: temporarily move the “problem” unit closer to the main unit (same room if possible) for 24 hours. If the random offline problem stops, it points to distance/obstruction rather than a defective unit.

Would moving it closer be realistic, even just as a test?
Customer
Yes, I can try that. If it still goes offline even when close, what would that suggest? I don’t want to replace things if I don’t have to.
Technician avatar Technician
Good thinking — we’ll prove what’s happening before talking about replacements.

If it still drops even when close, the likely causes shift to the “upstream” side:
• The modem/ISP connection is flickering for a moment (the mesh reports it as offline).
• The Ethernet cable between modem and the main mesh unit is loose or failing.
• There’s a configuration conflict (for example, the ISP router is also routing while the mesh is routing).

A very safe check is simply swapping the Ethernet cable (if you have a spare) and making sure the modem-to-mesh cable clicks firmly at both ends. No settings, no risk.
Customer
I can swap the cable. Also, my ISP router Wi-Fi is still on. If I don’t change settings today, is there anything I should avoid doing?
Technician avatar Technician
Yes — and I’m glad you asked. To keep things stable while you test, I’d avoid these “worsen-it-by-accident” moves:

• Don’t factory reset the mesh or the modem unless we’ve gathered a couple of clear clues first.
• Don’t rename the Wi-Fi network during troubleshooting (it can confuse devices and muddy the results).
• Try not to place mesh units behind TVs, inside cabinets, or on the floor near thick wiring/power bricks.

For now, your best low-risk plan is: test the point closer to the gateway, plug it into the wall, and swap the modem-to-mesh Ethernet cable. If the dropouts continue, we can narrow it down to ISP/modem vs. mesh mode (router vs bridge) with a couple of simple observations — no scary settings changes required.

Quick answer: the accepted fix

Accepted first fix for WiFi mesh going offline intermittently:
• Plug the “offline” node directly into the wall and give it airflow (heat + power strips cause dropouts).
• Temporarily move the node closer to the main unit for 24 hours to test distance/obstruction.
• Check and re-seat (or swap) the Ethernet cable between the modem and the main mesh unit.
• If you have both an ISP router and a mesh, note whether the mesh is in router or bridge mode before changing anything.
• Use the safe restart order after outages: modem first, then main mesh, then satellites.

Why a mesh WiFi starts dropping offline “out of nowhere”

Intermittent mesh outages often begin after a power cut, a quiet firmware/app update, or a small home change (moving a node behind a TV, adding electronics nearby, or switching a cable). With wireless-only mesh, the “link between nodes” can weaken from distance, walls, or interference, so a point may disconnect and then recover. Another common cause is the upstream connection: a brief modem/ISP drop, a loose Ethernet cable, or two routers running at the same time (ISP router + mesh router mode).

How to tell if it’s the ISP, the modem, or the mesh node

When the mesh shows offline, try a simple split test: if websites fail on Wi-Fi but work on cellular, it’s likely the home network path. If wired devices also lose internet, the modem/ISP side becomes more likely. If only one node drops while others stay stable, distance/placement/heat is a top suspect. Keeping notes like “which node” and “what light color” helps you avoid repeating the same guesses.

WiFi mesh keeps going offline — safe troubleshooting tips

Start with power, placement, and the modem-to-gateway link before changing settings.

Good first checks: plug the problem node into the wall, move it slightly into open air, and test it closer to the main unit. Re-seat or swap the Ethernet cable from modem to the gateway mesh unit. If the issue began after a power outage, do a calm restart in the correct order (modem → gateway → satellites). If you have both an ISP router and a mesh, look for signs of a “two routers” setup before making changes.

Disclaimer: This information is AI-generated and intended for general guidance only. Avoid factory resets unless you’ve confirmed the basics first, and follow your device maker’s safety instructions.

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FAQ

Why does my WiFi mesh keep going offline intermittently?

This is commonly caused by a weak backhaul link (distance/walls), heat or poor placement, a loose modem-to-gateway Ethernet cable, brief ISP/modem dropouts, or two routers running at once (ISP router + mesh router mode).

Did this start after a power outage or update?

Yes, it often does. After outages or updates, the modem and mesh can come back in an odd order and take time to stabilize. A safe restart sequence (modem first, then gateway, then satellites) is a good first check.

Is it safe to troubleshoot this at home without changing settings?

Yes. Start with low-risk steps like plugging the node into the wall, giving it airflow, moving it closer to the main unit for a test, and re-seating or swapping the Ethernet cable. Avoid factory resets until you’ve confirmed the basics.

How can I tell if the ISP/modem is the problem instead of the mesh?

If Wi-Fi fails but cellular works, it points to the home network path. If wired devices also lose internet, the modem/ISP is more likely. If only one mesh point drops, placement/distance or that unit’s link is more likely.

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