Or whatever it's called, in Act 2 following Khasim outpost there is a timed dungeon, when I failed it due to alot of dying on high latency on my part (a well renowned problem) I did not finish the dungeon in time and suffered my first ever hard crash from Diablo 3. The kind when your screen freezes up and your speakers start screaming at you and all you can do is flip the switch.

Probably worth investigating after the initial problems such as 3007 3006 and huge latency are remedied