[CRASH] Repeated game client crashes

Two games in a row where I've connected to a Co-op vs AI game then had the game client not load so the server thinks I've left. Currently typing this with the League loading logo sitting over my screen because the game won't actually load but the login client has closed. Attempts to reconnect give me a message saying my firewall may be blocking the game and/or the game has crashed. This is strange, as the game worked yesterday and I don't think my firewall has updated since then.

What the heck is going on?

How to reproduce bug: Attempt to load an intermediate co-op vs AI game? I have no idea. Seriously I want this solved as much as/more than tech support does but I have no idea why this is happening aside from maybe internet connections for my entire town being brought down by a storm or something (and if that's the case how am I posting this?) Frequency: Twice in a row so far, apparently caused by attempting to load a game. I'm scared to try for a third, and will be closing the LoL client after this reconnection attempt.