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Bad ignition switch could be a good call !
So could dirty corroded contacts on the faceplate. Everything depends on the Faceplate mounted controls communicating to the Head Unit. This is all accomplished through the dozen or so contacts.
Clean them all on both units using a Q-tip and some alcohol. Then reattach the faceplate making sure all the contacts are properly aligned between both units. This is very often the cause of radio troubles.
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