I've noticed that quite a few of my discs have problems. Spider-man locks up when it switches to the other layer, Spaced Series 2 has a glitch near the beginning, and a few others jump around after a while. Other discs, however, play perfectly. I'm using a Samsung DVD-811. Do other people have problems with the occasional disc, or is it more likely to be a problem with my DVD player? I don't want to upgrade if the problem is just down to the iffy quality of some discs.