I have another "sometimes it works, sometimes it doesn't" with the radio on my 2008 Expedition. When it was not working, I checked all the usual things: connections, ground etc., and next on the list was the wires to the speakers. With the radio turned on, but no sound, the front speaker wires were all connected so I went to check the bedroom speakers. When I turned on the overhead light in the bedroom, sound booms out of the radio. I have no idea why, but when the radio does not work, I go turn on the bedroom overhead lights and it works. Don't know if this will help anyone since it is probably a gremlin particular to my rv.
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