I asked a similar question as mine won't start playing a cd while moving, only when I've stopped the car. Suggestions were: use one of those disks which clean the laser I think, take it to an audio shop to be refurbed or it could be the shock absorber on the back of the head unit which are bad for breaking. I'd just buy a new one, if you don't want to sped a lot you could just buy another standard head unit second hand, can pick them up cheap.
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