I need help with my wii?

help please, i sofmodded my wii and installed homebrew channel, bootmii and dvdx. and now my wii turns off after 15 mins of play. please help this is getting annoying, is there anyway to remove dvdx? im not sure if that the problem but my brothers wii was softmodded and he didnt install dvdx and his dnt turn off. so is there anyway to remove it all and revert the wii back to normal with no mod or patches? plz any help would be helpful. thank you. has anyone expirienced this before?