Anyone give me an idea why my A6 C6 Avant randomly loses all sound from the stereo and CD player. Happend today although it's happened before. listening to the radio Refuelled got back in the car and no sound nothing no matter what I did, MMI dispay was normal and I could select diff stations & CD but no sound. left the car for about 45 min while doing a bit of shopping came back to it and all fine.