Update: since rebooting and turning OFF restart every hour option it has remained stable and connected.
I had the HomeKit integration working on my C-5 and there were no problems. Since migrating to my C-8 it is showing not responding sometimes. The only thing that seems to being it back is to reboot the hub. When it is connected all works great. Not sure why losing connection. I do have the restart option switched on in the integration app.
Should I just do the “nuclear” option or ?
I too am having this same issue with the c-8. Only thing that seems to fix for me is restarting the hub. I had the toggle for restarting the integration toggled off. I turned it on to see if that makes a difference.
It was stopping after a few hours. I toggled that switch for the HomeKit integration to restart every hour and restarted the hub. Now it seems ok. I am on the 3rd day in a row where I have not had the issue.