what is wrong with my cd player?


My cd player plays cds for an hour or so and then when I change the disc it will not read any more cds, this only happens after it has warmed up, it plays fine when I first turn it on, what could cause this?
kedoades
dirty lens. there are sweep CDs but the best if you go inside the mechanizm and clean it right there but with caution not to destroy the mechanizm.
Sound's like a laser going bad. If you can see the lens, get a can of compressed air and, about six inches away, blow some at the lens. Occasionally, this will remove a stubborn spec of dust and all is well. May the force be with you.