I bought four KP105 switches around a month ago and have three of them with halogen uplighters connected to each, and the fourth has LED under counter strip lights connected in the kitchen.

Daily, sometime in the evening when the lights are on, often between 8pm and 10pm, sometimes later, all the switches power cycle at the same time. I haven't noticed them doing this more than once in a day, and I've not heard any switching when they're in off setting.

They seem to cycle in sequence very closely together, so within a couple of seconds each in turn has turned off and on.

The switches are configured in the Kasa app but there are no actions or scenes that would do this and the time seems to be random. They are also connected to Alexa but again there is nothing configured there that should cause this as far as I know.