I have a few HS200 as well as HS210.
The light switches work as expected manually and from the app.

From time to time the lights wil flash (go on and off) a few times, as if someone if touching/playing with the switch, but no one is touching the switch.

This happens to all the light switches.

I removed some of the switches from their WiFi connectivity and they don't go on and off when the ones which are connected to the WiFi do.

Any pointers as to how I can troubleshoot why this is happening?

Thanks!