I am having problems with my dvd writer. I use NERO Burning ROM to write DVDs. During writing, the "Used Read Buffer" level jumps about between 20% and 100%, sometimes even going all the way down to zero. Also, the "Buffer Level" (which I think is the hardware buffer) jumps about between 89% and 95%, sometimes going down further (but not often). Since this started, I have replaced my DVD writer but it is still happening. All this happens even when no other programs are running. Please help!