ExactlyTheres also a few other damn good reasons to play from USB drive rather than dvd: faster loading times, less noise, no annoying discswapping, no dvd wear, no disc wear etc etc
Just posting to confirm that playing the PAL version has indeed fixed the issue for me. (or at least has for now) Finished the second temple, no freezes. So far so good!
I think the problem is really the Wii. I think it can cause randomly lockups like this. I got my save and played the game on other Wii. I've passed the part that the games locked up, saved, and got back to my Wii. Just finished the game now, with no problems. But when I try to go back to the map the game locked up... when, it locks up =D