Hi, I've previously had a wii u 2 years ago but it broke around november 2013 and I got a new one in december 2013 (or probably refurbished) wii u from nintendo and the wifi worked fine a year ago up until after christmas and I noticed this started to happen after the two smart tvs that my sister and parents got which bothered my wii u's wifi so I secretly disconected both their wifis on the tvs but my wii u still has issues :/ I reset my router yesterday and changed the security and that actually gave me an error free day of wifi so I thought I fixed it... but this morning it did it again so I imagine whatever caused the problem is connected to the wifi again -_- I manually set up the wifi this time and put a DHCP or however its called through my router with my wii u's MAC adress and the IP I used so I havent checked if it helped but I will change the routers password just to see if someone outside of the house is using the wifi X.x
also the wii u is the only thing giving me this issue cause the wifi does work on everything else but my wii u will be connected and than not be connected and is unable to connect and than will randomly decide to connect so I assume its just some causing interferiance rather than a hardware issue maybe?