Liteon 812s kprobe scan, what is the problem?

I have a liteon 812s and I am burning a Sony 4x DVD+RW at 4x using Nero This is a data dvd created using nero express. The following is a kprobe scan of the DVD, which more or less is the average for all the DVD+RW I have burned so far(3). Although the DVD-Video fared slightly better. I dont know what could be the problem. Any advice would be appreciated. Thanks!

There is always the option of trying different firmware. :iagree:

I thought US0F was the newest one, will an older firmware work better? if so which one do you suggest?

Could it be a hardware problem?