Can't tell if it's a card or driver issue. Started happening after switching from an AMD 7950 to the GTX 780 Ti. Using 340.43 drivers off of NVIDIA's web site. Even tried Driver Fusion to wipe off all remnants of AMD drivers, reinstall of NVIDIA drivers, reinstall of CoD4 and re-patch to 1.7. Basically, every so often the game will pause and unpause, usually during very inconvenient moments during gameplay. Does not occur on Battlefield 4, CS:GO, Titanfall, or even COD: Black Ops II. Video of what I'm talking about: https://docs.google.com/file/d/0BwMfCsXwjEEeTjFUbDAxVkl1bjg They usually don't happen that frequently, just got "lucky" when filming that video. But it's infuriating when they interfere with the gameplay.