there is part of your issue.
uninstall Daemon Tools and and damn SPTD.
SPTD almost killed my LG. SPTD causes data bottlenecks.
When I set 6x burn speed in LG, LG got up to about 3.4x and started choking, burn speed was erratic, and often failed.
when I uninstalled Daemon Tools and that SPTD junk, my LG started to burn at 6x with no issues.
If your not a pirate, there is no need to have Daemon Tools on your PC, use a normal virtual drive software that doesn't screw with your IDE/SATA controllers.
using free Slysoft Virtual Drive now, and never looked back.