Super Mario Galaxy 1 and 2 freeze in USB Loader GX

I have a problem with Super Mario Galaxy 1 and 2. After I collect a certain number of stars the game freezes and when I open it again that star isn't saved. After some internet search I changed language to english and video to NTSC but only difference is that higher amount of stars is needed in order for a game to freeze. After that I tried changing video to PAL but that didn't work. I couldn't find anyone who had the same problem. Is there any way to fix this?