Wasn't only until around the time did I pick-up my Wii did this problem start occuring...
My problem was hugely exadurated when I got my WII, and it still seems to be killing my bandwidth. changed my router to channel 6 and the total dropouts stopped though. I get the feeling the Wii's WIFI module hasn't been designed too well- it's supposed to listen and give way to other Wifi Signals as should all WiFi adapters.