Hello, I've been running the game fine for a few months now but in the last week or so the game will stutter as if it was taking time to load up parts of the game or something, I checked the fps and saw that every time this happened the game would drop about 5 fps on each burst (3-6 bursts in a row in one second intervals typically going from 60 to 55 fps). It can be quite jarring and very distracting. I've searched for days on google but I am not even sure if I'm searching for the right things as I can't find anyone with the same sort of problem. The rest of the game runs fine and I don't have this problem with any other games (online or offline). I've also tried looking into an event log to see if something else was running to cause some kind of hiccup, I've done a virus checkup and clean, I've cleaned the inside of the PC thoroughly, I've changed the video and display settings to see if anything would change and all my drivers are up to date . I'm just at my wit's end here trying to find a possible reason. Any help would be appreciated and apologies again if this post is in the wrong place. Thank you.

My system specs are as follows;
Windows 8.1 64-bit (6.2, Build 9200)
Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz (8 CPUs), ~4.0GHz
16 gigs
AMD Radeon R9 270