Client just shuts down

[Tallenn]

I've run across a very irritating problem. I'll be playing the game (usually killing stuff), and the client will just shut down. I assume I go LD. So far, it hasn't caused any deaths, but it's only a matter of time. More importantly, the game is just unplayable if I know the game could crash at any time.

This has just started recently- I was playing fine for three weeks prior, then this past Sunday it happened 3 times within about a half hour of loading up.

I already updated my Nvidia drivers, and it is still happening.

Any ideas?