I’ve had intermittent issues with Roon and Sonos over the years but this latest one has brought the whole thing to a standstill. My fallback when Roon wouldn’t play nicely on the Sonos network was to take the Airplay route. However Airplay has now started breaking up - a problem which sounds like a dodgy bit or wiring!!
My Mac server recently updated to OS Tahoe 26.3 could this be the cause?