seahawk98,
I have the L4200 3-disc changer in my 94 Camry. It too plays all of my cdr's. I think the L4200 is just an older version of the one you have. There is definitely something wrong with your unit. Again, try cleaning the lens. By the way, I believe these units were actually made for Toyota by Alpine. They use a standard Alpine 3 disc magazine. I just thought I would mention the fact they are Alpine units just in case you need to get it repaired at some place.
I would also suggest you try your cdr's in a friend's car and also try some of that friend's cdr's in your car's player. That way you can pinpoint whether it's your car's player or the way your cdr's are being burned that is causing the problem.
Mike