I'm well above my pay-grade here, so this is just a possible musing...
?
Did you upgrade to some of the most recent FW (I'm assuming this is a CP4)??
There's some issues with HomeKit, DSC, etc. that these newer FWs break related I think to certificate management.
I don't use these interfaces but I'm sure if I updated my CP4's it would break something that they haven't identified, and maybe this is your issue...
I've been staying on the "cp4_2.8003.00056.01.puf", as it seems to be *reasonably* stable...and you know what 'reasonably' means...:)
?
Just throwing this out as a possibility...
