Just updated my system to see if it would go away, problem still exists. (although it seems to take longer to happen now both with xbmc and extreme-tuxracer)
media-libs/mesa-7.7-r1 x11-base/xorg-server-1.7.4 x11-drivers/xf86-video-ati-6.12.4-r1 x11-libs/libdrm-2.4.17
Just updated my system to see if it would go away, problem still exists. (although it seems to take longer to happen now both with xbmc and extreme-tuxracer)
media-libs/ mesa-7. 7-r1 xorg-server- 1.7.4 xf86-video- ati-6.12. 4-r1 libdrm- 2.4.17
x11-base/
x11-drivers/
x11-libs/