OHMSS - Picture "hang ups"

[Gnomus]

I have recently purchased On Her Majesty's Secret Service. When I tried the disc in my OPPO BDP-93, I noticed that from the outset there were numerous times when the movie would "hang up" for a second or so before continuing.

I tried the film in my Sony PS3 and it played without a glitch.

I tried it again in the OPPO - same problem - numerous times when the picture would freeze up for a second or two. Interestingly, these pauses did not occur in the same place. Sometimes a section that "hung up" before would play smoothly when tried again.

I returned the disc and got a replacement from Amazon. Just tried it in the OPPO - exactly the same problem.

The OPPO plays all other discs without issue. I don't understand why the OHMSS disc should be giving me problems like this. Are there any known issues with OHMSS. Does anyone have a solution.

Thanks in anticipation.