This could be a case of the laser drive 'carriage' sticking. Even when new the clearances are small and the edges can actually catch on the sides/underside of the slot. I have occasional trouble with my DC in cold weather because of this. Once warmed up no trouble.
Usually just pressing down the disc more firmly than normal frees it. But if someone has been inside the DC and damaged the drive mechanism or the case is damaged you've got more serious problems. It does sound as if your laser is moving OK to begin with but then sticking. If this is drive trouble you may never get your DC working without repplacement but if it's catching on the casing and you can identify where it may be repairable.
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