Sorry for posting so much, but i just got my e-class and i need to iron out the kinks

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Ok well the problem is, sometimes when i put a dvd in my dvd player in the car. It will play the DVD but when i get out of the the system will start to lag and run slower and sometimes freeze completly, last night the cd stacker door wouldnt close and the lights just kept flashing. Its really embarassing as i was showing one of my friends who has an S55.
Any ideas what could be causing this? It seems to be the DVD but im not sure.
Thanks