I have a Dodge minivan, and have experienced similar. Most of the discs I backed up at first won't play. Sometimes glitchy video, no audio, sometimes nothing at all. I have had success with (don't know why) newer 8xspeed -r media. I have not figured out which and why, but it might also like to see the first play menu that original dvd's have, I need to experiment more, but for the most part I have not been able to leave only backups in the van, as most will still not play. I hope this helps, and if you find anything out that helps let me know as well. I use Shrink and Decrypter.