I'm getting a bug splath, only when using the alpha client. It started some days ago, maybe a week. It can happen during a game, when in champ select, when not used, it just closes itself. I hope that no-one else has this problem.
Probably going to repair the client
This board is the best place to discuss the client with Rioters and your fellow players, although it won't be our main source for feedback resolution. Look to the other tools, like the Submit Feedback button in the client, for that. As always, please follow the Universal Rules and keep content focused on appropriate topics for this board.