I bought my 3DS about 6 months ago, so it is still under warranty and it has been working great. This weekend though I tried visiting my friend's town in Animal Crossing New Leaf and kept getting a message saying: A unknown error has occurred. I tried to connect to that same friend's town using a different 3DS and was able to connect no problem.
I also tried to connect to his Wireless over the weekend and my 3DS could not find an access point even though I was sitting next to the router. I'm thinking my Wireless card may be bad or loose. Any suggestions of what I should do to troubleshoot?