In January 2010 marked the day of the THIRD radio being put into the vehicle. The music would just cut off and you would hear nothing. As per GM they don't diagnose they just replace the radio - the issue is that I still don't think the problem is resolved - only happens in really cold weather and now it is nice and beautiful - out of warranty - I think the problem will reoccur.. Of course, when you get to the dealership it is always working just fine - intermittent. Even took it in once when it was not functioning only to be told they had to bring a third party in to look at it and diagnose and they could not guarantee that they would find the problem three days later when it was scheduled to come in.. Very Frustrated with the fact that you were able to show them that the radio was not functioning.