i have a 405 diesel,into which i have fitted a goodmans dab/cd player (model gce 7007dab).the radio was fitted about a year ago,and over the past few months the cd's sound like they are scratched to b&^^%£"S.i only use copied cd's in the car in case the car gets nicked.when the engine is not running the cd's sound ok ,but turn the engine on they sound like an old 78 being played.on the house cd player they sound ok. thought the player might be loose but holding it in position makes no difference.any ideas before i send the unit back.ps the radio sounds ok.