Fedora 11 X crash after about 10 minutes playing

[carl]

System:
2.6.29.5-191.fc11.i686.PAE
( Fedora 11 )

Graphics adapter:
05:00.0 VGA compatible controller: nVidia Corporation NV43 [GeForce 6600] (rev a2)

Starting Overture and after about 10 minutes of playing X crashes and i get a distorted frozen image on the screen. This happens at seemingly random locations, other games and graphics seem to play fine. Keyboard is also unresponsive though sound keeps on playing.