Problem with burned DVD's

I finally actually started my new DVD burner that came with my new iMac. I just made the switch a few weeks ago. I'm having some problems with the copies of DVD's I'm making to back up mine for taking back to school with me. I am having no problem actually burning them, mac the ripper --> dvd2one --> toast, but when I try to play them in my Sony 5 Disc dvd player, is when my problem occurs. Around the 43 minute mark of all my burned dvds, the dvd starts skipping every couple of seconds. The first 43 minutes are fine, but then the skipping occurs. I tried playing the movies on my imac and had no problems. I also tested out the dvd player with a regular DVD and it also had no problem. Could it be the media I am using, Verbatim DVD+R's? Or is it just that my dvd player doesn't like burned DVD's? I had a friend make me a copy of another DVD awhile ago, and I had no problem playing it on the DVD player. Has something like this happened to anyone else? Sorry for the long post!

-Greg

 

just a question, is it ok to back up discs of dvd's you already own? I thought that was ok, which is all I've been doing.

also, I changed my burner speed from 8x to 4X and that has seemed to fix the problem was of now.

-greg