The Drunken Lizard Pub

I rarely reboot the system until I encountered this issue. I've since rebooted it once. It seems to be running better now.

I've been playing this game now for over 30 hours without a glitch on a MacBook Pro. Since yesterday for no apparent reason (haven't downloaded anything e.g. updates, firmware, other apps) it crashes on me without warning.
Just wondering if anyone else has had a similar experience and/or if I ...