Technician helping fix Tuya not discovering devices in Smart Life app

Steve H.

Expert ★★★★★ 27,853 satisfied customers

Specialities: Streaming device Wi-Fi dropouts, 5 GHz band issues (DFS channels, channel width, band steering), mesh Wi-Fi roaming, router security modes.

Why a streaming device drops off 5 GHz Wi-Fi — common reasons and the safest checks

Technician avatar Technician
When a streaming device keeps dropping off 5 GHz, it usually isn’t “random.” It’s often a setting change, a channel issue, or the device bouncing between access points.

Let’s start with the safest checks first. I don’t want you to factory-reset anything or change a bunch of router options all at once.

Quick questions (just to aim the diagnosis):
• What device is it (Roku, Fire TV Stick, Apple TV, Chromecast, Android TV box)?
• Did this begin after a router update, power outage, or switching to a new modem/mesh?
• Does it stay connected on 2.4 GHz (even if slower), or does it drop on both bands?
Customer
It’s a Roku. It started this week after my internet provider replaced the router. On 5 GHz it goes offline during streaming. I haven’t tried 2.4 GHz yet.
Technician avatar Technician
That timeline helps. A new router can change two things without telling you:
• the 5 GHz channel (sometimes a DFS channel that certain devices don’t handle well)
• the security mode or “smart connect” behavior (band steering can push devices around)

Before we touch settings, one quick “risk-free” check: when it goes offline, does your phone/laptop stay online on the same Wi-Fi, or do multiple devices glitch at the same time?
Customer
My phone stays online. It’s mainly the Roku. It will show “not connected” and then reconnect later.
Technician avatar Technician
Good — that points to a device-specific compatibility or signal issue, not the whole internet dropping.

Two safe checks that don’t “break” anything:
1) If your router has a single Wi-Fi name for both bands (sometimes called Smart Connect), is there a way to temporarily see separate 2.4 and 5 GHz networks?
2) On the Roku, can you check whether the signal strength shows “Good/Fair/Poor” (even a quick glance helps)?

We’re not trying to optimize speed yet — just stability.
Customer
Yes, it’s one Wi-Fi name. The Roku shows the signal is “Good” most of the time. The router is in the next room.
Technician avatar Technician
“Good” is reassuring, but 5 GHz can still drop if the router uses certain channels or wide channel widths. Some streaming devices behave fine for browsing, then fail under sustained video load.

Trust moment: I don’t want you changing advanced radio settings blindly. If we change anything, we’ll do one small adjustment and observe for a while.

One more question that often explains this: is your new router a mesh system, or a single box? And do you know if it advertises Wi-Fi 6/6E?
Customer
It’s a single box, Wi-Fi 6. I don’t know much beyond that. I just want it to stop going offline.
Technician avatar Technician
Understood — stability first. Here are three “safe to check” items that commonly change with Wi-Fi 6 routers:

• DFS channels: the router may pick channels that some devices drop from without a clear warning.
• Channel width (80/160 MHz): wider can be faster, but sometimes less stable for older streaming hardware.
• WPA3-only security: some devices behave better on WPA2 or mixed mode.

You don’t need to adjust them yet. Just tell me: do you have access to the router settings page/app, and does it show anything about “DFS,” “160 MHz,” or “WPA3”?
Customer
I can open the router app. I see WPA3 is enabled. I also see something about “Auto channel” and “160 MHz” but I don’t know what those mean.
Technician avatar Technician
That’s exactly the kind of detail that matters here.

A safe way to test the cause (without committing to a “big change”) is to compare behavior on the other band:
• If your router app can show the Roku’s connection band, note whether it stays on 5 GHz or bounces.
• If you can temporarily connect the Roku to 2.4 GHz, that’s not a downgrade — it’s a diagnostic. If it stays stable there, we know the issue is specific to 5 GHz settings/channels rather than the device itself.

I’m not asking you to reconfigure the whole network. We’re just trying to isolate the reason.
Customer
Okay. I tried connecting it to 2.4 GHz and it stayed connected longer. The picture is fine but maybe a little slower to start. So it’s probably the 5 GHz side.
Technician avatar Technician
That’s a strong, clean result — it points away from “bad internet” and toward how the router is running 5 GHz.

The most common “environment” triggers with a new router are:
• Auto channel selecting DFS channels (some devices can drop during radar checks or channel moves)
• 160 MHz enabled (can be touchy in busy neighborhoods)
• WPA3-only (or strict security) causing intermittent handshakes

Trust moment: I don’t want you to chase settings you don’t understand. If you’re comfortable, the safest adjustment is usually choosing a simpler, more compatible option (not the “fastest” option).
Customer
I’m comfortable making small changes if they’re safe. What should I look for in the router app without messing everything up?
Technician avatar Technician
Safe approach: aim for “stable and standard,” then observe.

Without doing a step-by-step reconfiguration, here’s what to check for in plain language:
• If security is set to WPA3-only, see if there’s a “WPA2/WPA3” mixed option (more compatible).
• If 5 GHz channel width is set to 160 MHz, see if 80 MHz is available (often steadier).
• If the 5 GHz channel is “Auto,” see whether you can pick a fixed channel that is not DFS (some apps label DFS; others don’t).

After any single change, give it time and watch whether the Roku stays connected during a longer stream. If you change three things at once, it’s hard to know which one mattered.
Customer
That makes sense. I see a WPA2/WPA3 option and 80 MHz. I’ll switch one at a time and test. If it still drops even after that, does that mean the Roku is failing?
Technician avatar Technician
Not necessarily. If 2.4 GHz stays solid, the Roku’s Wi-Fi hardware is still working. Persistent 5 GHz dropouts can also come from location (walls/TV cabinet), interference, or the router moving channels on its own.

If it keeps happening after the “standard stability” checks, the next safe information to gather is:
• whether the router logs show channel changes or reconnect loops
• whether the Roku has a pending system update
• whether another 5 GHz device in the same room also drops during long streaming sessions

You’re doing the right thing: calm, one-change testing. That’s how you avoid making the network worse.

Quick answer: the accepted fix

Accepted first checks when a streaming device drops off 5 GHz: compare stability on 2.4 GHz to confirm it’s band-specific, then review router settings that commonly change on new Wi-Fi 6 gear (security mode, channel width, and auto channel selection). If available, prefer WPA2/WPA3 mixed over strict WPA3, and consider a more standard 80 MHz width instead of 160 MHz. Give each single change time to prove itself during a longer stream. Save full resets for later — only after you’ve ruled out roaming/channel behavior and simple compatibility settings.

Why 5 GHz can look fast but still disconnect

5 GHz Wi-Fi often has higher speed, but it also has a shorter range and can be more sensitive to walls, TV cabinets, and nearby interference. New routers may also use DFS channels or wide channel widths (like 160 MHz) that work great for some devices but cause dropouts for others. If your network uses one Wi-Fi name for both bands, band steering can move a streaming device at the wrong time and trigger a “not connected” message. That’s why a simple compare test on 2.4 GHz is a useful diagnostic, not a step backward.

How to confirm the fix is really stable

Don’t judge by a one-minute test. A device can appear fine, then go offline during a longer video session when the connection is under steady load. After any single change, stream for a while and watch whether the device stays present in the router’s connected-devices list. If it drops and reconnects repeatedly, note whether the router changed channels or the device switched bands. This kind of observation keeps you from chasing the wrong cause.

Streaming device going offline on 5 GHz — quick troubleshooting tips

Start with safe checks that isolate the cause before changing advanced settings.

Helpful checks: compare 2.4 GHz vs 5 GHz stability, look for WPA3-only security, and note if 5 GHz is using auto/DFS channels or very wide channel widths. If your router combines both bands under one name, consider whether band steering is moving the device mid-stream. Make one small change at a time and give it enough time to observe. If you’re unsure, stop and take notes — guessing can make the network harder to troubleshoot.

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 streaming device start going offline on 5 GHz suddenly?

This often happens after a router replacement, firmware update, or a network setting change. Auto channel selection can move 5 GHz to a DFS channel, or the router can enable wide channel widths by default. Security changes (like WPA3-only) can also trigger intermittent reconnects.

Is this a router setting problem or a streaming device issue?

If the device stays stable on 2.4 GHz but drops on 5 GHz, the device is usually fine and the issue is band-specific. That points to channel behavior, interference, security mode, or band steering. Hardware failure is less likely when one band stays reliable.

Did this happen because of a Wi-Fi 6 router or WPA3?

It can. Some streaming devices work best with WPA2/WPA3 mixed mode instead of WPA3-only. Wi-Fi 6 routers may also default to 160 MHz width or aggressive roaming features. Testing a more standard setting can help confirm the cause.

Can this be checked safely at home without resetting everything?

Yes. Compare 2.4 vs 5 GHz stability, confirm the device stays listed as connected, and make only one small router change at a time. Watch for channel changes and repeated reconnects during longer streaming sessions. Save factory resets and firmware updates for later, once the connection is stable enough to complete them.

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