TS-h943 Problems on certain backups

[Grandmaster]

i did read up on this bfore posting i no there are some similar questions.I recently flashed another t-s ms28 original discs are fine and it has troubles with certain backups most run fine ive set the firmware up with FW X52A.bin allways fast. All the other sammys i did the same and they all work fine. I tested a pile of games and only a couple seemd to mess up. and 1 of the games i got my bros wife to bring up her backup and that ran does this mean its just being piccy with the backups or shoulld i use the default quite\slow FW and reflash it. Comes up with the dirty disc clean with a cloth or whatever it says somtimes when booting the backup or it freezes while plaing it. Any help allways appreciated thanks in advance

[yivkX360]

It may just be a bad laser if some backups read.

[zillionare]

try 52b and report back if it makes any changes for the better.