Hi everyone. This is my first time, so patience please. I'm using a Pioneer 109. I am presently using Phillips DVD-Rx8 with Nero 6,and DVDshrink. Some dvds playback fine throughout. Others go all pixelated after about an hour, but never in the same place. I always shrink to the hard drive. The problem happens on playback to pc and dvd player. Am I using lousy media?