The fact that all 6 discs freeze at the layer break seems very strange. Disc rot could account for one disc doing something like that but not all 6. Have you tried to play a scene from later on the movies via the chapter scene menu?
Did you buy them from Ebay by any chance?
Yeah this was going to be my question as well. There is the potential that you may have purchased a knock off product and not an actual pressed disc set.