We can add another to the list as I discovered this happening to one of my Tapo plugs this morning (P110).

I have 5 Kasa plugs and 2 Tapo plugs. I don't know if there is any similarity in hardware between the brands because I've had no problems with the Kasa plugs, and now both Tapo devices have failed.

The first one is permanently on now and will not cut power, regardless what the switch is set to (it still toggles but makes no difference). I discovered the second doing the behaviour described above in my office this morning. It appears it could have been ticking on and off continuously for nearly two days which is worrying because it powers three devices (power to one device then two others running via USB). I'm just hoping no damage was done.

Really disappointed in TP-Link who I've used for various networking products over the years. Let's hope the Tapo lights I have are a bit more robust.

  @keypickles  I've just lost 2 115s in as many week, constant clicking turning off and on, I bought 4 of them about 3 years ago. So I've replaced one of them with a brand new 105, well it's been boxed up on my self for 2 years, so will see if that' will do any better. One of the 115s that failed wasn't even used but it was plugged I. .