New problem. Drove the car and was listening to the radio. Stopped for dinner and when I returned the radio was nonfunctional. No AM/FM, XM, and no Ipod. When switched to XM the DIS displayed "Check Antenna". Drove car home and still no response. Next morning started car and the radio worked just fine. This has happened three times now. Anyone else having this issue? Haven't taken to the dealer as yet because no sense going in when radio is functional.