@Riley_S I installed the replacement and all is well for now. If it fails after some number of days, I'll advise. Thx!

@Riley_S I haven't done that. I have 30 other Kasa switches installed so I assumed the line was ok, but I will check that. Thx!

I've installed the KS230 Kit V2 and it failed after about 10 days. I purchased another and the same thing happened. The mode of failure is one where the led status lights suggest the switch is...