Tapo P110 smart plugs keep disappearing from the Tap app

I have 6 Tapo P110 smart plugs.
Three were bought months ago, and three more were bought this month.
The older ones worked fine, and so did the new ones when I added them to the Tapo app, and then connected Tapo to Google Home,
Now, periodically, all the devices will disappear from visisbility in the Tap app, and also from Google Home..
Also, if I add a new P110, it appears in Tap, but all the other existing devices sidappear.
Then randomly they may appear again in Tapo app.
I can't run my devices like this. If the Tap app cant see the devices, I'm not going round setting them all up again (and again )
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One possibility is that smart plug are disconnecting from the cloud, which causes the third-party control to fail. In this state, the smart device will show offline in the app if your phone is on a remote network (e.g. cellular data), in some rare cases, the device might disappear in the app.
You may check if the plug is visible in the app when your phone connects to the same local wifi network. To avoid network switching and interference, disable cellular data, turn off VPN, ad-blocker apps, and other relevant apps during the test.
If it is indeed a remote control failure issue, refer to the suggestions here in Case 2. Cannot use the Tapo app to control my smart devices
If it is not that case, more detailed information is required for analysis. Submit an app log in the app after the problem occurs again. The support team will help to assist with the case. How to get the log of Tapo app
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@David-IT the devices all disappear from talk app when viewed on my android phone (Android 15) and my iPad.
This is when I am at home, and v all devices are connected to the same home broadband/wifi
My broadband is a new install by we and gives me WiFi 6 coverage at home and 900mbps to the internet.
All devices are set up in tapo on minute, and added to Google how via the 'works with Google homes' option.
The devices are setup and visible in both Google home and tapo.
I created automations in Google home, then some time later, all devices in Google home are listed as off line, and the devices have disappeared in the talk app.
A few hours later, they really appear in tap, and I have to add them to Google home again, and modify all the automations that use them, as the device is no longer recognised.
This sequence has happened at least 10 times.
I haven't tried modifying the frequency option for the WiFi yet, but the devices work at first, then disappear.
Why?
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@David-IT My router was a BT Smart Hub 2, but has since been swapped out for an EE Smart Hub Plus.Full fibre (900Mbps).
Its using wifi6, with WPA3
I haven't had any issues recently, but haven't been trying to add a new plug.
I'll give it a go and see what happens.
The new router is currently set to default EE DNS - 81.139.56.100
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For everyone reading this thread, be carreful, don't do the 1.3.4 upgrade, this will crah all your plugs, you will lost everything. TP-Link has implemented a very big bug with this f... version.
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