I played some 1v1s earlier in the day just fine, but this evening I did some ranked 5s and my game froze. First time I killed the process so I could try to hop back in as quickly as possible, but then it happened again shortly after and I got a short leaver penalty. I took that time to update my graphics drivers (geforce game ready 591.44->591.86) and verify game files (no problems). I also lowered settings from ultra to medium. I jumped into 1v1 again to not disrupt full teams in ranked, but it's still crashing after a few minutes of play.
Everything on screen freezes, and then if I wait a minute or so I end up back in the lobby. It also froze a few times in the menu while I was messing with settings.
I was watching my task manager and core temp readings during some of the crashes, and didn't see any abonormally high usage.
Log attached.