Can't burn full speed on a plextor 16x

Okey this is what has happen.

I burned a ton of cd in 16x with no problem whatsoever. The all of the sudden I get errors in 16x. It started happening one disc good one bad one good one bad. Then I suddenly can no longer burn at 16x. 14x and 12x works fine but in 16x i get the same error towards the end of the disc, all the time any program.
The error is 03 0C 07. I have already tried different medias (like 10 different from cheap to expensive, no cigar. I also tried a clean install. It is not a computer problem becuase my raided hardisks pumps a sustained 50mb/s (70 tops) and I have 1gb of ram and dual PIII 1.0ghz. I am using XP and this happend all of the sudden. Tried all the firmware, and get the same thing, and I can't burn in 16x.

Any help would be apreciated.
 
BTW: can some one explain what Burnproof is supposed to do, becuase it definateely doesn't help in buffer underuns
 
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