Very annoying. Chime sounds like the chime when you push the info buttons( tire press. oil press. trans temp. ect) will chime once, twice, or three times. The radio will blink off and show the corvette name like it does when you start the car. Changes from fm to xm and volume may change. GM does not have a fix for this problem, tho they are aware there is a problem. Brand new, problem started within two weeks of owning, very expensive GM vehicle. There is a bulletin for this problem, and it basically says to teach the owner how to operate the radio controls, and DO NOT CHANGE THE RADIO. Someone please help GM fix my car.