Plextor 716AL

I figured out the problem with Nero’s system info and the problem with my secondary IDE. I’m still having problems with the burner. It appears to have read issues just when I’m making a backup of a DVD. I can play a DVD and a CD with no problems. When I try to make a back up using Nero 6.6 the burn fails while it’s reading the source DVD. I’ve checked and triple checked and everything is the way it’s supposed to be. I just can’t figure out what’s killing these drives. I’ve only heard good things about plextor and it just doesn’t seem like they should be dieing the way they are. Has anyone had a similar problem and if so what did they do?