I agree with Jim, that the likely problem is where your DVD player is changing layers during playback. As he said, try playing the DVD on your PC, if that works, try a different DVD player, go to a friend's house if you don't have another one, and see if it will play properly in a different player. If so, then the issue is a combination of your DVD writer, the discs you're using, and your DVD player. You can try a different brand of DVD DL discs, to see if that helps. If not, you could split your program up into two, single layer discs. Less convenient, but they should play okay.