I've been having this problem alot lately. Seems everytime I change zones I crash, or even when I'm riding a chocobo of finishing a FATE I will get a random crash. It seems to happen also when I click out of the windowed screen to another program, which I've never had a problem with until now.

My Setup
CPU: AMD FX-4100 Quad-Core 3.70 GHz
Video Card: Sapphire Radeon 7970 HD with drivers fully updated.
Ram: 8GB DDR 3