Flash - you seem to contradict yourself, but I'm assuming you are saying the problem you're describing is "intermittent", right? (Sometimes it happens, sometimes not).
I know what I'd do if the thing is under warrenty - I'd get it fixed/replaced. Do it now before the warrenty expires.
If it's not under warrenty, at least talk to the company that made it. They may have some ideas. You can also poke around in this web site:
http://www.willmanselectronics.com/ although they may not work on Sat radios. I found some good information for the radio in my Honda there.
- Jack