Sony DRU530A - stopped reading burnt data discs

I have a sony cd r/rw dvd±r/rw…recently it stopped reading the data discs I have burnt with it. The crazy thing is…it will read any discs I burnt that contain pictures,videos, or music. But discs on which I burnt only data, i.e…files or saved programs…it shows as blank after I insert the disk and wait for a lengthy attempt at a reading. As far as I know I havent made any changes to my PC or added any new hardware or software. I tried some of the suggestions in the “failure to read” FAQ/thread…cleaned lense,reinstall drive and chipset drivers updated firmware ect.
Any ideas or help would be much appreciated.