About a month ago my radio started to act up whenever I tried to turn on Sirius radio. It got worse so I contacted Sirius customer service and they refreshed the radio. That did not solve the problem. It got worse. The favorite channel buttons greyed out and it would display Ch 1 when I tried to turn on Sirius. When I try to change channels it shuts the radio off and then it comes back on tuned to AM. I again called Sirius Customer Service and after numerous refresh attempts they advised taking it to the dealer. The car has less then 8K miles on it. So today I took it to Kerbeck for a diagnosis. Their answer was I need to replace the radio head to the tune of $290 plus labor for a total of $750. They say its a 3 hour job and they have to order the new radio head. I find it absurd that a vehicle with that mileage would have a failure like that. It is out of warranty so I have to foot the bill. Kerbeck said they consulted with GM technical service and that's what they recommend. My question is has anyone else experienced this problem and if anyone knows if there were any TSB's related to this. Kerbeck said they could not find any.