Hi, I have made some copies of an authored DVD. I'm using RecordNow DX on a Sony DRU510A burner. I have used several different media brands (memorex, starlogic, imation), -R's. Each of these copies play fine in one of my DVD players. In my other (older) DVD player they will play the first few minutes and then freeze up and quit. Is there something I'm doing wrong in the burning process? What can I do to fix the problem?