hey recently (3 months or so now) my computer has been having FPS spikes for about 5 seconds every 15 seconds or so....fps is great normally then for this 5 seconds it goes down to 4 and even 0 if there is a lot going on in the game....ive reformatted, so it cannot be viruses or anything and my system specs well cover the reqs for this game to run smoothly....any ideas on what might be causing this?