I have a KP400 Smart Plug that I purchased in January that is not working.
It was originally setup in January and had been working without issue. About a month ago I had to change my wifi account so I reset the plug (and the other two Kasa smart devices I have) and reconnected them to my new wifi.
Within a few weeks I noticed on the Kasa Phone App that the plug and its two outlets were shown but not available. While I was trouble shooting it I would see it become available but as soon as I clicked on it then it would show as not available. I then noticed on the notifications that it had been raising an Over Tempurature Protection (OTP) error.
Since I was not sure if it was the outlet, the extension cord or the lights that were plugged into the KP400 that might be the problem I unplugged the KP400 and a couple of days later I plugged it into an outlet inside my home with nothing plugged into it.
Overnight between midnight and 5:00 am it raised 6 OTP errors. Again, this is sitting on a quartz countertop, inside an air conditioned home with nothing plugged into either outlet.