Hey guys, so I recently got an audi a6 and I had noticed that after I turn the engine off the radio still plays, I mean I'm used to having cars that after you take the key out amd open the door the music stops, but this isn't the case with the a6. Even after the door is closed and the car is locked the radio is still on, is this normal? If not what can I do to fix it? I've looked everywhere and can't find people with the same issue, I have a friend who has an a4 and his radio stops working as soon as the engine is off. Please help guys.