Hello, my wife and I just purchased our Regal about a month ago. We have the Harmon Kardon ( I think it is spelled right) system in our vehicle. We are having an issue with the volume in this system. If we turn the volume to 20 or higher, the radio seems to have a mind of it's own. The volume will go up and down on its own and fades in and out on its own. We have turned the auto speed volume off and we have taken it back to the dealer multiple times now. The service department told us they upgraded the software but that did not fix the problem. Now they are trying to chalk it up to being either sound wave issues or that it is the bass in the music causing the problem. Our particular vehicle was made in Germany, we have done research and found nothing that can help us with this problem and the service department and managers at the dealer we bought the car from have pretty much bailed on us. Is there anyone else out there that has this issue? If so, we ask that you let us know how you might have been able to resolve your issue and to please go on the Buick website and notify them as they are telling us that they have never heard of this problem before as it has never been reported. We have all payed way too much money for these cars to just live with the problems and they should be fixed. Thank you very much. Dennis & Michelle