Cause: This is a common problem with most DVD players. During video playback, most drives drop down to a lower speed to cut down on the excessive noise they make when spinning at high speeds. In technical terms, this lowering of the speed is called riplock. In poor-quality DVD drives, riplock is responsible for video stutter.
Solution: When choosing a DVD drive, make sure it won’t suffer from video stutter - ask people who have bought the same model you’re contemplating. Essentially, opt for drives from known manufacturers.