That happened to me, and I had to transfer my wifi ID to my bro's DS. Then I waited a few weeks and it finally started working again. It was strange.Gengar said:My WiFi is all messed up, apparently. Something about me having to update my card's ID or something...I dunno'.
Believe it or not though, I tried playing Wild World last night (since I'm sick, and all I could really do is play DS games)...though that didn't last long, and I ended up playing Tetris for like an hour. =P