NERO 6/7 "Focus or tracking error"

Hi,

I use Nero 6 or 7 to burn daily backup ISOs to DVD+R media (e.g. CMC) with my LG GSA-4167B (DL13) at 16x but for some time Nero returns a “focus or tracking error” after some minutes and then aborts burning.

I first supposed a hardware defect of the LG drive but then I tried Deepburner (Free Edition) and the burnung of the ISOs worked without problems at 16x!

So, what’s up with Nero?!