Hi - I have listened to ABC Classic for 10 minutes without interruption (1:10 pm Sat AUS time). Sorry, could not check for longer, not much of a classical fan. Maybe delete the station from My Live Radio then add it back again. Good luck.
ABC Classic FM streams that stop partway through are usually caused by the station stream itself, or by how Roon is handling that specific Live Radio entry.
Remove ABC Classic FM from your My Live Radio list, then add it back again and test the stream once more.
Try playing the station to a different zone, to see whether the interruption follows the same station across devices.
If the issue continues, please let us know the exact local time + date of the next stoppage, and we’ll enable diagnostics for your account.
Also, what platform is your Roon Server running on, and when did this start happening?