A couple of days ago I would have responded that you probably have a fault with your machine as, although I had a lot of problems like those described in your two posts with early issues of the firmware, recently I have had no problems with my 596 (V1.30).
That was until last night when I was watching Once Upon a time in the West (R1). I had a complete freeze up at the end of Chapter 13 and had to power cycle to recover. This may be at the layer change as it is almost exactly halfway through the film. After reboot, I selected Chapter 14 directly using the Meridian OSD and all worked fine to the end of the film. I also tried fast search back and forward past the "freeze point" and everything works OK.
Are these issues of discs being authored differently these days? If so, why do they always seem to play OK on cheap players?
Malcolm