Turn on Wii U gamepad and it says on its screen something about it having lost connection with Wii U, and to turn it off & move Wii U gamepad closer to console, then try again.
That didn't work. So unplugged everything and tried again but same thing happens.
WiFi is fine on everything else in house. Router/Wii U/gamepad all within like 3 mtrs of each other aswel, with nothing in-between.
I'm stuck :(