I have been having reception issues with my XM and don't know where to start looking for problems. I have the factory Bose w/nav but no dvd. For the last 2 days the XM cuts out about every 10 seconds, like I am parked under an awning or going under an overpass. There is one spot where on my commute that it cuts out every day, which is a dead zone for just about everything, but now it does it non-stop. I live in a pretty flat area, and even parked the signal will go away for 5-10 seconds, come back for a couple, and then go away again. Can it be a problem with the wiring?