Super Mario Galaxy and Rabbids Go Home-problems

I just installed Super Mario Galaxy PAL-backup on my USB to play the game again (I owned the retail copy before but it broke). I tried to continue my save by going into Battlerock Galaxy but the game starts to lose the music halfway. I can continue on but the if I try to go to the observatory or complete the mission, the game goes into black screen. Sometimes the game hangs even when trying to access the galaxy (after choosing a star it goes into a white screen and there it will hang up. Gotta hard reset my Wii)

Also got myself Rabbids Go Home PAL, but when I tried to load the game, it just hangs on the "Game Needs The Nunchuk to play"-screen.

I tried these with different CIOS 38-revisions (from rev17 to rev 21) and CIOS 249 dx2 V8.

- Super Mario Galaxy goes into black screen after selecting a file (Rev 17 - Rev 21). dx2 V8 makes the game do either the music problems or the galaxy mission selection hanging.

- Rabbids Go Home hangs up in all CIOS revisions.

Anyone knows what's wrong?