Your Wii is set up for hdd loading and well, since you've tried various WW, a US copy, and they reset after 30min, I can only speculate that it's a hard drive issue.Just played WW, but I got a US copy from a friend. Lasted for just over 30 mins before the Wii shut off. This is only the third time it has gotten passed the Dios Mios splashscreen.
Yes, there's just one partition and it's primary and active.
Also tried copies of WW from other sources, too. All have the same result. /=
Been a while, got sidetracked by Terraria.
You might want to try out DM Lite and run WW off an SD card to see if it still craps out at 30min. If it does, then you can be most assuredly sure that it's the hard drive then (which would be weird since your Wii games play just fine).