Scans starting to tank at 66%mark

I had great scans for awhile but now my burns are starting to tank at about the 66%mark. PIF is at about 230 then scyrockets towards the end. Any help would be appreciated. MC0003 Verbatim discs 1673@1693. Thanks

try another burn with KS09 or JS0B. the madia can also be a problem, maybe a bad batch.