Roon and Sonos intermittent problem

Been running Sonos to a end point in the bedroom for a year. All ok. Now Roon ‘loses control of Sonos’ after a minute of play. Roon works fine on all my other endpoints. Sonos works fine to the problematic endpoint also. This means all the hardware seems to be fine. Did Roon upgrade their Sonos interface lately?
PS the system works fine at times during the day. Its at about 10PM that is stops. This is a time when all my resources at unded the least.

I may be forced to buy a Chromcast disk to replace this node.