While driving and listening to the radio the sound just stops. After the vehicle sits for some time the radio comes back on, but after a short while it shuts off again. This happens with both Sirius radio and local stations. This of course is very irritating. I have read other complaints concerning this exact same problem. It apparently happens around the 70-75,000 mile range. I cannot find anything about how to fix this problem. Is Buick doing anything about this??