Prehaps its the router? I mean, my router sucks and i've got 1 wired computer a computer on wireless and the wii on wireless... and even before the wii it used to just lock up and stop giving any internet (i found it was the router after a little investigation). I've still got the crappy router because i have no choice as its in a contract for 12 months, but as soon as 12 months pass hopefully i'll be getting a decent router that can actually handle things connecting to it...
Not saying you've got the same problem but it is likely. All the connections just overload your router...
I couldn't imagine the wii stealing much bandwidth as it doesn't use alot of it to do anything, when it updates, yes its downloading, when its turned on it probably sends a message out to say ooo look im here to the router... but nothing more until you play a game or anything...
But i could be completely wrong...
