your unit sounds damaged!
there are a few folks on this post that mention the same issue ,it was either a reset or a replacement. My unit works perfectly, so far, always right on the road, and all that stuff.
Sirius: I know what you are saying with the favorite song feature. sirius does it, but so far, I have not found out how to do it on 'this' unit. When I had a portable player, I could simply do that with a push of a button.