There has been a recent change to the BBC Streams. You may have heard the 'Shoutcast' announcement on BBC radio stations that was being broadcast for some time. Here is a link for reference: 851N
I'm getting a 'Shoutcast' message when listening to BBC radio stations
If your 851N has stopped playing BBC radio stations, we would suggest deleting all the BBC stations you have set as presets, and then re-setting them as presets again, as this should resolve the issue. Please see the following article on how to set radio stations as presets via the StreamMagic app here
If you have updated your preset to the newer DASH/HLS stream type and are still hearing the message then do not worry, the BBC may still be broadcasting these messages on these newer streams as well for the time being. This is a message put out by the BBC themselves, and not something we have any control over.