I am having this problem since i bought my GTX 260, while i am playing world of warcraft or battle field 3, screen goes black for 5 seconds in wow turn back on but i experience a heavy FPS (Frame Rate) after that i need to restart the game to go back to normal FPS, in battle field screen goes black and it wont allow me to come back to the game.
Mother Board: GiGABYTE P55A
Rams: Kreton DDR3 2G X4 Chips. (8 Giga).
Processor: I5 2.80GHz
Power supply: GIGABYTE 500 W.
VGA Bios info: Version: 62.0.50.0.2
Driver Version: 9.18.13.1422