Cant read PSX games ???

[Hube]

I know this topic should be in the PSX chapter but I don't think anyone will see it then. Anyway, when I try to back up any PSX game (black underneath) I start to read it with CloneCD it reads up to about 60-65 % and then it stops, I dont get an Error message but it sounds like it has problems reading the disc, I've tried all the discs in Both FF8 and FF9 with the same result. Does anyone know why this is happening and how to solve it?