I know that the Jensen brand radio/dvd players had this problem. The solution was that a "travel screw" to prevent damage to the unit while being shipped had not been removed before installation at the factory. It was located on the top of the unit. Go online to your unit's manufacturer and see if they have something like this. Hope this helps.
Bob
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2013 Ford F250 SD 6.7L
2014 Wildwood Heritage Glen 282RK
Certified Rumble Strip Tester
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