http://i.imgur.com/uy24N.jpg
It doesn't happen on start up usually, and only typically happens when I've been playing for a few rounds (usually < 20 mins of game time).
I've already got the latest drivers for my graphics card and my graphics settings are already on medium - low on the game anyway.
Any idea of anything to fix this issue?
Thanks,
EDIT: system specs
Intel i7 920 : 2.66GHZ
4GB DDR3 Ram
32GB SSD
1.5TB HDD
NVidia GTX 260 with approx 2.6GB of GPU memory
Asus P5Q Motherboard