Is it possible for DVDs to wear out? I don't mean if they get scratched or dirty, I just mean from being played a lot. My Dallas DVDs have some episodes that don't play at all and other episodes where it freezes and then skips a few seconds or even a few minutes. They didn't do that at all when they were new and the older they get, the worse the problem gets. Has anyone else noticed that? This never happens when I play movies on DVD. My Dallas DVDs have no visible scratches so is there a problem with the way the Dallas DVDs were made, since my DVD movies never have that problem?