When it comes to my Wii U and internet, I have to be right next to my sister's router for the console to appropriately handle online access. In my room upstairs, everything (Mac Mini 2011, Wii, Nintendo 3DS, iTouch) works great except for Wii U. Which sucks. Because then I'm still stuck with old messages from Miiverse the last time I had a stable internet connection with the Wii U, as lovely as the messages are from the users in those communities.
I want to say it has something to do with interacting with routers that have a 5hz frequency. My sister's router supports 2Ghz and 5Ghz. My Mac Mini had a similiar problem this use with Wi Fi use, so after like weeks of trouble shooting I figured something out and works like a champ ever since. Wii U not so much...
Whenever I beat NSMBU, I want to download all the indie games but am really looking forward to Nano Wii U, Trine 2, and the supposed Bit.Trip Runner 2 coming out very soon. omg.