I can confirm your findings.jfkm wrote: I wonder if among those affected by these disconnections, configure all HOMEKIT or not? It would help me to confirm or deny my track.
Had the disconnect roundabout twice a day and after 2 weeks the relais got completely stuck and had to remove the power.
Just after the last powercycle I removed the thermostat from my HomeKit Setup on my iPhone and guess what - not a single disconnect in the last 2,5 days! I didn't even had to reconfigure the thermostat for that.
Funny thing is that I already mentioned that to the support, if maybe the homekit integration might be the problem. Didn't react to that though...