hi all, i have updated my wii from 3.2U to 4.2U with safe updater and according to the guide in the forum with all IOS and trucha sign. i have bootmii installed and back up my nand on 3.2U. everything is work fine, however when i play some games like rabbid tv party or need for speed nitro and etc. after returning back to the wii menu i get an error that the system files are corrupted. usually i can return to wii menu after rebooting but some times it takes few tries. anyone know what is the reason, should i go down to 4.1U? i will appreciate your help.