TFT crashes, client closes (and error message closes, so no screen shots)

This is a new version of the same issue I had before. Before I would get into a game and then get screwed over by DC'ing (game would freeze and I'd have to close using task manager to rejoin).

Now I don't even make it into the game.. Is there a way for the client to detect when a person never makes it into the game? I'm legitimately trying to gain ladder points and work my way up, but I can't take this nonsense causing me to lose points just after promoting.

Any ideas on cause or solutions?