Clip Sport 8gb - won't sync more than 4-5 cds, then drops off computer

when you rip a CD with a program that does not have the option to get the song info (i am not sure what version of Nero you are using but this was not available in older versions IIRC)  you will have to enter all the ID3 tag info manually. You can either rip with something like Windows Media player and set it to automatically get song info or use a program like MP3 Tag to enter it manually. 

Have you tried the Mp3 player with any other computers? If so and the same dropping issue occurs the player may need to be replaced. For that contact sandisk support.