Gee, every miscompare is on bit 7 and only at byte 2 in the sector, which makes you think of a background app is doing something like stripping the bits. However, I doubt a background app would change VOB data on the fly. It looks like a bad burn/memory error. The drive is getting "on", too. And, you might like to go back to the official firmware and see if that changes anything.
Regards