same here ;) but not while playing only sometimes when I close it... it is thought to reset your graphic processor I believe so its not overheating if you overclocked or something , though this might be buggy.
right click desktop
settings tab (top right hand side)
advanced button (lower right hand side)
look for vpu recover tab and select it
toggle enabled vpu recover to disable (un-check it)
click ok
Had the same problem while was using ATI card & dont remember how i solved it, try something of the following, maybe it will help:
1) update gfx card & mobo chipset drivers
2) remove overclocking
3) clean your cooler / get a better one / put it on 100%
4) your gfx card is broken
dunno if shutting it down is an alternative :p
settings tab (top right hand side)
advanced button (lower right hand side)
look for vpu recover tab and select it
toggle enabled vpu recover to disable (un-check it)
click ok
http://forums.relicnews.com/showthread.php?t=40933
1) update gfx card & mobo chipset drivers
2) remove overclocking
3) clean your cooler / get a better one / put it on 100%
4) your gfx card is broken