Sudden and Random HUGE FPS drops since last few patches

[hockeywarrior]

Vertical sync is turned off both in game and through Nvidia control panel.

Usually the first time I hop in game it works fine for the first 5 minutes or so, then will suddenly dip into the single digits for no reason. It then occasionally "pops" back into normal FPS, but eventually gets stuck in single digits until I restart the game. If I quit a mission and restart it, more often than not it will START in "low fps" mode right from the beginning.