Randomly, it seems only when I have a gamecube controller, my wii turns off after like 10 minutes, and I cant turn it back on unless I disconnect the power cable. Then I turned off the system and turned it on without the gamecube controller, and as soon as I plugged it in, the Wii turned off. I don't know why this is.
Can I guarantee that it wont turn off if I play without the GC controller? Thanks.
Is this an official GameCube controller made by Nintendo, as some third-party controllers are incompatible with the Wii console?
But even if it is an official controller, it could still be defective and might need to be replaced, so perhaps you should try it on a friend or family member's Wii console to see if the same problem results.:)
As you mentioned your Wii console shuts off on it's on during game-play - I recommend reviewing the troubleshooting steps you may locate by Clicking Here. I also posted the information here as well for your convenience.
The system plays for awhile, but then shuts off on its own
If none of those tips help you, I recommend contacting Nintendo at 1-800-255-3700, between 6am - 7pm, Pacific Time, 7 days a week for further assistance.
Hope this helps and good luck!