I looked at the breaker again and realized it was a GFCI breaker which is sensitive to any trickle current. Is there a warning in the kasa packaging? - do not use on a GFCI circuit.

I have the same problem with random tripping of the breaker. Very annoying! It happens when i have more than 2 Kasa switches on one circuit. My theory is that there is a constant trickle current to...