try a few older games that's not a Dual Layer DVD...
see if it's always successful.
then perhaps your lens is slightly too dirty to read Dual Layer DVDs..
I have a few problems with my wii at the moment! First of all, i just bought guitar hero world tour, and it worked fine for a bit, but then suddenly messages like "an error has occured" seem to pop up and i just dont understand how this could have happened =/ This is also happening to my Super smash bros brawl disc.. I dont know if it is thie discs which are the problem or if its the actual wii console itself.
Can someone help me please?