I purchased a new Chevy truck in August with an XM receiver as part of the in dash entertainment system. I have had no problems receiving XM signals until a few days ago. Now it seems every time I pass under a bridge or any type of momentary overhead obstruction I get loss of signal for a second or two. When I first starting using XM in the truck I could get the signal even parked under my metal carport, now I get no signal at all. Is anyone else having problems like I'm experiencing?