I used to own an ARC CDT-1 transport that had a very similar problem right after I purchased it used as it was very picky which CD's it would play. I used a dry Q-tip and very lightly cleaned the laser lens making sure I didn't leave any strands of cotton and that solved the problem. When it was shipped it was really cold and brought into a warm environment and I thought maybe condensation had something to do with it. If it's been happening a while not sure what the problem may be for your unit but worth a shot if you can gain access to the lens.
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