What burning/playing software are you using?
You could try uninstalling/reinstalling the program. If that doesn't fix the problem, is the drive still under warrenty? If so return it, if not it may be time for a new one.
EDIT:
You could also try cleaning the lens. 
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Well, if crime fighters fight crime and fire fighters fight fire, what do freedom fighters fight? They never mention that part to us, do they?
-George Carlin
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