[Hellfighter]

hold the disc and tilt it side to side see if there a hair line crack in it, some items a disc will go bad some times or get damage over time of use.

deep scratch or cracks in a disc will do that. resurface the disc to remove scratch in it could fix it, again could be the disc (CD/DVD) player maybe going bad too or its need's tobe clean inside it. disc player cleaner buy them real cheap, they have small bushes on the disc, when inside the disc player they clean the disc reader of any dust that maybe on it. disc damage or any crack in it can make it so it skip over files to read