I using DVD2ONE and for the most i get excellent copys but sometimes when i make a copy and watching the movie there are some parts in the film that has some glitches, the picture gets weird, cant explain this in a better way, my english isn't the best , sorry! But when i burn this movie again it looks good! I use 1x when i burn! Should i shutdown all applications in the background or what? What causes theese "glitches,errors"?

Thanks!