Hi, I need help whit my nintendo wii

I've been using my Nintendo Wii for several months, and I'm having a problem with several games while using USB Loader GX or CFG. The problem is that while I'm playing Guitar Hero or some other game, after about 20 minutes...The game freezes or the console freezes, and I have to unplug it to continue playing. I've already tried installing new cIOS, configuring USB Loader GX, and reinstalling the Homebrew Channel. I've tried all the apps to make games work via USB, but it keeps freezing. I can't find a solution. I hope I can get some help. I just want to play my Nintendo Wii without it freez ing every 20 minutes.