My 1997 A6 Quattro with the Concert head unit is doing exactly the same thing. I only bought the car last week to replace my superb BMW 7 series. Hopefully this isn't a sign of things to come with the Audi. Hopefully someone can Identify a company who can fix this annoying problem. Most Eeproms are push/pull fits so can be easily removed and refitted but finding someone to program it initially may be a bit of a problem and I really don't want to shell out for a new head unit as the sound quality when it works is superb.