After the Sonos software update to version 79.0-52294, I get the following message on my Sonos products:
COMMUNICATION_ERROR
Der UPnP Speaker RINCON_7828XXXXXXXX ist nicht registriert.
I checked the UPnP Speaker RINCON with the following link and RINCON is ok.
http://IP-my-speaker:1400/status/zp
My system
OS: openhabian
OpenHAB: 4.1.2