Don't know if this has anything to do with it but thought I would throw it out there just in case.
Are your windows tinted? If so, what type of tint did they use. When I went tint shopping to get quotes the were explaining to me the different types of tint. Basically they said that alot of the newer cars are now coming with antennas in the glass. Due to that you can't just use any type of tint. It has to be a non-metalic tint (I believe that's right) so that the tint doesn't interfere with the reception. Just something to look into.
