Can't read DVDs Burned with 812S

All discs I burn by TY/Ritek/Ricoh/Prodisc/MCC at various speeds are perfectly readable by my 812 burner but don’t work in anything else including my Lite-On DVD-ROMs or others. My kprobe scans are excellent when I scan with the 812 but when I do a read test its a different story. I originally though it was the Riteks but after trying many other brands I’m thinking something is wrong with my drive. Also the discs that have failed recently are from spindles that I have had work fine a couple weeks ago. I’m using current firmware and nero. I’ve included my latest/best scan along with a read test. Any help would be apprecated.