Game has never crashed in the past month with the same setting, however, it happened at this morning. The game just freeze unpredictably, and there's nothing I can do. I'm playing in full window mode, so I can still alt-tab back to my desktop and kill the process with task manager.
Here's a brief list of my hardware (I can add more if necessary):
OS : Window 7
CPU : i5-3450
VGA : Radeon HD7700
RAM : 8GB
This crash also took my Lv58 hardcore character away. I hope Blizzard can find out the problem soon.