Consider posting to this forum: http://forum.digital-digest.com/
which seems to get much higher response rates than THG forums. Also, is it possible your DVD disks are China bootlegs? If so, then you have disks that are bad as a result of bit rate down conversion problems. Finally, suggest you bring your problem disks to a friend to play or your local Best Buy and play on one of thier high end players looking to compare performance.