I am having minor problems with my CD player in my 2007 Limited Coupe non NAV. When I start the car the CD player makes a chattering noise sometimes for maybe 15 seconds. Will not eject CD sometimes. I get a "stop" message sometimes and the CD will not play. I had a local dealership replace my head under warranty and I still have the same problems. They come and go. The dealer said this is a $1147 head unit. I may change to an aftermarket head unit down the road but I would like to get this one fixed while under warranty. Has anyone else had similar issues?