I've been having this same error for some time now. Also I get "Pure virtual function call" crash randomly. I know the connection issue isn't normally client side. I have a continuous ping running to google dns (8.8.8.8) and have had connection trouble only with this game.

I know they'll try to blame you and your side, but with all these problems showing up and everyone trying to (re)connect, the servers are being overloaded. As they say, they are working on upgrading the servers, meaning they can't handle the amount of traffic they are getting. My guess is it's a LOT higher than they were anticipating.

From what I can tell, with all the people connecting, the clients are basically conducting a DDOS attack on the server without knowing it. Simply by spamming connect.