I don't know what I'm doing ....it worked last night...now I go to play a movie on wii with Netflix, & it plays....then stops every 30 seconds or so to buffer or something
So, it didn't buffer often (or, as often) the previous night? If you've moved the router or are trying to use the Wii's Netflix when other people are using the internet, this could be the cause. The Wii's internet is hardly a powerful or quick service, after all.
That, or you watched the movie in a lower quality previously.