Client has stopped responding

Over the last month or so at least 3 or more times in a day my client will just stop working causing me to dodge and wait for ever to play another game. I would like to play League of Legends. I don't care about the LP I lose but the fact that i have to wait sometimes more than 30 minutes for something that isn't even my fault is ridiculous. I can't imagine it would be hard to make sure the client doesn't stop working or close at random times. So please Riot; you have one game, fix it.