Anyone have this problem??? Recently Some of my channles are disappearing. I've lost 6, 21, and 4o. Maybe more. I have a Pioneer DEH-P3370XM unit. XM tried everything on their end and couldn't find a problem. I did a receiver reset and that didn't help any. Any ideas? If I can't fix it myself I have to have the unit taken out for about a week and sent out for service.