Optiarc external DVD burner MTU certified

[Shaza]

Could someone please tell me why my MTU burner can not read my EK Pro Burn karaoke disks but it will play in the same drive through Windows Media Player (without the words obviously)?
Also, I tried to duplicate 2 new karaoke cd's I bought and it seemed fine until I got to the end few tracks, then the karaoke cd player just couldn't read them. Or it would start playing the music with no words on say track 12 but 1-11 are fine? When I play it on the PC it breaks up as well, but it's fine with the original cd in a standard karaoke cd player? Does this sound like a burner issue? Help!
Sharon