When you put a CD in the player, it looks like it's reading it but then just shuts down the whole radio system. Once the disc is in, you can't access the radio, tape, or XM features. It's like everything shuts down. Car has to be turned off, then re-cranked before the radio can be used again, I guess a re-boot of sorts.) Any ideas on why the CD player over-rides everything and does this? (Navi system)

Thanks!