My Samsung 709 has stopped recognising and playing dvd-r's I've recorded on my Pioneer A104, no matter what type of media is used. It continues to play dvd-r's and +r's recorded on friends players. The discs continue to play perfectly on my Cyberhome player and both the 104 and my Asus E616 drive but my cousin says a disc I recorded for him last week refuses to play on his Sony player. I use either Nero 5.5.10 UDF disc or Vob Instant CD/DVD to record with UDF 1.02 setting on both. I originally used Prassi Primo DVD, but it started screwing up my discs. Am I suddenly doing something wrong or missing something, or could their be something wrong with my burner?