So my Dad drove my A4 B8.5 (2014) a couple days ago, he had played around with the radio settings as when I came back it was on one of the frequency wavebands. Didn't think much of it but went back to my favourites and selected my saved DAB radio station, all was normal, the station worked fine. However, the volume was too loud so I decided to adjust it, this is when the problem started. Instead of the volume getting adjusted I got the volume bar displayed and "currently unavailable", I tried to turn the MMI on and off and the car too, but it just was not having it, it would not let me adjust the volume. So I went into the radio list and picked another radio station, there I could adjust the volume fine. So I then went back to the favourites DAB station and still same problem, cannot adjust volume. Then I thought maybe if I add the station manually back into the favourites it will fix the problem. So I pressed the "Waveband" button and lo and behold, the "DAB" option has vanished!!!! I can no longer search for new DAB stations, I can only play existing DAB stations in my favourites and cannot adjust the volume on them . Anyone had this happen to them before? How can I fix this? I am completely surprised that such a thing is even possible, the DAB radio stations work perfectly fine but it simply does not let me find new ones or adjust the volume anymore. It's like the software has confused itself and will no longer display DAB options.