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Stop using cheap no-name "home burned" CD-r's in the player and it'll work fine. Cheap CD'r's are <thicker> than store bought music CD's and get stuck in the player..
I'm assuming you got the shaker500 or 1000, I looked them up, and they tend to be very faulty, and a lot of people got the same problem. If using another cd don't work save yourself the trouble and buy a new head unit if you got the money for it.