Foxhound2,
Make sure you have the latest firmware for your Sony DRU 710A.
New media is introduced all the time and you need to update the firmware yo keep pace as well as correct any bugs the unit may have had in earlier versions.

The Sony DRU-710A is made by Liteon, it"s equivalent to the 1633-S Liteon.
The latest stock frimware for your drive is BYX4, when you open CloneDVD2 it will display your firmware version. Try updating the firmware if not up to date and slowing the burn to 4x to see if that corrects your problem.

Please read up on upgrading your firmware before you do anything, it is critical you know what your doing and don't load the wrong firmware. It's very easy to do but educate yourself before attempting.

Link for the BYX4 Firmware
http://codeguys.rpc1.org/firmwares.html#DRU-710A

You can read about your burner and firmware instructions here
http://club.cdfreaks.com/forumdisplay.php?f=44