After I have played FA2 for any length of time, if I alt+TAB, or close the game, my PC slows to a crawl. The mouse "floats" when I move it a direction, in that direction across the screen, and task manager will not let me shut down my PC without a power button long press shutdown. Any ideas why this is happening? Im using the unmodded GOG FA2 install, and have a decent machine running win 7