I have a Plex 24X TLA# 0101 firmware 1.03 (haven't upgraded to the fresh 1.04 yet) and I have tried
every possible combination of thing. Read/write spee, with and without AWS, Read retries 0, 3 etc.
The only way I've duplicated (although I shouldn't use that word as it isn't perfect) is by using Betablocker 2.51 with a low read/write.
The Plex can copy the game without modification but runs only in the burner.
There were a lot of rumours spread a few months ago when 2.51 came out, that simply lowering read/write cured it - 99% of people who tried this failed (only worked in burner).
I'm not doubting the validilty of your account - I just don't believe you.