So I recently picked up a refurbished Wii U from Nintendo, I've been having some issues connecting to the internet. When I first attempted last week, I was unable to connect at all. I attempted to fix the problem, but ended up being unable to. At the time, I had a couple friends over, and we decided it wasn't worth the trouble, so we just fired up MK8.
Fast forward to today - I turn on my Wii U, and voila - it somehow manages to connect to the internet on the first try. Great, I think, now I can install Wind Waker (the free game I chose). I start the installation and leave for a while. I come back later to find the Wii U has turned off due to an hour of inactivity - again, this is fine. I turn it back on... And am unable to recconect to the same network I was connected to just over an hour prior. I've attempted to set it up manually, as many people recommend, but still no luck. I keep getting error code 103-1001, which seems to be rather common. I've disabled my security key in hopes that that would help, but still nothing. I have no idea why this isn't working - or why it worked before. It's really frustrating, and I'd really rather not send my Wii U back for repairs only a week after recieving it.
Any advice on what I can do?