Hi i've had exactly the same problem, it was driving me insane :a . I
had been using 4x RITEK [RITEG04] blank dvd-r's (white printable
surface) i also tried using a 4x 'Verbatim'/CMC Magnetics dvd-r's and
had the same thing, ok for the first half then pixelating/skipping
from then onwards (esp near the end). I then went to a retail store
and bought a legit Verbatim dvd-r (8x) (MCC 02RG20 [Mitsubishi] and a
TDK dvd-r (TYG01) [Taiyo Yuden Company), these were individual cd's.
Tried them and they worked perfectly. Today i also bought and tested
some 4x RITEK [RITEG04] and they worked fine, according to the person
who i bought the just bought Ritek's, said there were 2 kinds of
Ritek's (G04), the A Grade and the B Grade ones.
Try going to
sp and maybe flashing your drive. It might help, but first try
downloading kprobe (http://kprobe.cdfreaks.com). Read up a little on
how to use it, otherwise you might get lost. This program will be
able to tell you what burner you have, the model, the firmware
number, and other info about dvd media (dvd-r/dvd+r) ie. model
If it helps, i have a LITE-ON SOHW-812S, Firmware Revision: US0N. I'm
about to flash it up to US0Q.
Hope this helps.