I actually had this same issue. I tried fixing it by switching from browser to browser only to find the same error. It actually took me switching to a different router in order for it to start working again. I suspect it may have something to do with wifi considering it worked for you when you used data.
That seems like a legit reason, but from what Red's said it might not be. I don't have anyone else's internet around to try, but I might tomorrow, and I'll take my phone and try their wifi, just to see. Although hopefully it will be working at home on mine by then. I'm sure the staff's hard at work trying to figure it out ^^
Also @ Hakumi, thank you for your reply, and link to the thread Red originally posted in.
