bsg69,
Geez, I don't know. Your media is good. Your burn speed is reliable.

Do you leave your computer alone while backing up? You cant multi-task when burning ... very bad. Turn off your antivirus and any other active softwares that may be triggering during a burn such as automatic updates etc.

What brand of player do you use? Some high end players (Bose, Marrantz, others ect.) have real problems with any burned media.

Also, what brand and model is your burner? Is it capable of bitsetting/booktyping? Only newish players do well recognizing plain vanilla burned +R media.

Whisperer