If I recall, in most cases it occurs when you turn on the car with a CD in the player, but not playing (listening to the radio - or nothing at all). If you eject and re-insert the CD, the problem goes away. I don't think there is any known fix other than that. I don't know if getting your dealer to swap it out fixes it, but I think most are thinking that one day they'd like to replace the unit with a more current aftermarket model anyway.