2 out of 4 games crashed today - Crash report?

So today in 2 out of my 4 solo queue games, the game has crashed. Not 2 in a row. My 2nd and 4th game.

The first time this happened was during the game. Everything froze and I was unable to click anything. No "disconnecting" and no music. After about 30 seconds I closed the game and seen an error message and something about a dump file location.

I quickly started the client up again and rejoined the game. I was able to play the rest of the game with no issues. No lag, 40+fps. All good, if not for the fact of falling behind and my team losing.

The next time it crashed was a little different. I was unable to close the game and was forced to hit the power button to turn it off and back on again after waiting for at least 3 minutes.

This time I was unable to speedily load up the client and get back into the game. So I guess that one counts as a "leave" and I probably got reported a bunch (probably both times.)

A similar thing happened a few days ago but I just assumed it was one of those random things that have no cause and likely won't happen again. I did the repair method just in case. Now it seems there is a problem and I fear it will continue happening.

I'm unsure where the crash dump file is located. If anyone could help me find it, I'll post it. I'm running windows 7, if that makes a difference.