abc radio stations not playing on sonos 1 - sill playing on sonos 2 (other stations still playing ok on both)

Yesterday ABC Radio National stopped playing on Sonos 1. Did the standard checks… it will play on a standalone Sonos 2 speaker, and all other stations still play on both 1&2. I’ve tried using Sonos Radio and RadioApp (I know it was taken off TunedIn a while back).  when i try through SonosRadio nothing happens, when i try through RadioApp it gives the ‘unable to play/connection is lost’ message - but i can still play other radio stations.