xFi Advanced Security and Honeywell Water Leak Detectors

For many years I have had several Honeywell Water Leak Detectors as part of my home network.  These leak detectors connect directly with my home network and not through a gateway.  They wake up every 24-hours to report temperature and humidity to the Honeywell server, which is then displayed on a phone app.  They have worked very well for me, and precluded some water damage events in my home

I recently enabled the xFi Advanced Security feature.  Yesterday all eight of my Honeywell devices went offline. No amount of resetting of these detectors could get them to re-join my home network

I also was notified by the xFi app that a threat was detected in that an outside source with a USA ip address was trying to connect with a device on my network called "Generic Brand Vendor Ampak".  It also stated the threat had been mitigated - how I don't know.  After some google digging, I discovered "Generic Brand Vendor Ampak"  is the name resolved when you enter any Honeywell Water Leak Detector MAC address into an online MAC address finder.  Apparently the xFi Advanced Security feature did not appreciate the communication from the Honeywell server to these leak detectors.

I must say the xFi Advanced Security does not do this everytime, as these detectors talk to the Honeywell sever daily and I only occasionally get a "threat" notification.

Today all the Honeywell detectors came back online - why I do not know.  But I have concluded the xFi Advance Security feature has a conflict with these leak detectors, so have disabled this new Xfinity feature for now.