CD Player



I am having problems with the 6 disc CD Player in my Chevy truck. Fir 3 yrs. or so it has played all the disc I put in it, now all of a sudden it will only play the media produced ones. If I put in a burned disc that it has been playing for yrs. wait followed by "Initializing will come up in the view window and it won’t do anything. I have to puch unload shut it off and on then push unload again to get the CD out. Can anybody give me an idea what’s happening?
Thanks jamre 99