When I try to “play now” a BBC radio station on the roon server (iMac) roon sometimes doesn’t play. It and asks me to select an audio zone (even though one was already selected), will then select the already selected zone and if I press the play arrow it will play but very broken up and crackly. Sometimes it will play OK. Other times starts playing crackly. Other times play for a few minutes and then stop. Clicking play may play very crackly. Playing the radio station on a different zone tends to stop after a few minutes and has to be started playing again, but no crackling.
Seems to be OK on non BBC streams.
When playing crackly stopping and starting again seems to eventually fix it. Killing coreaudiod process also seems to fix it.