After updating to Wii System Menu 4.1U using Waninko's Firmware Updater, my Wii gives the error "The system files are corrupted" any time I exit the Wii Fit Plus channel using the Home button and selecting Wii Menu. The Wii gives the same error the next time I boot the system. I then shut down the Wii again and turn it back on, after which, it doesn't give the error. I only see the error after using the Wii Fit Plus channel and two reboots clears the problem. What can I do to prevent the same issue in the future? I want to continue using the Wii Fit Plus channel, but not if it means damaging the Wii.