Guild Wars 2

Just recently, maybe a few weeks before the spring update, my game has been randomly dropping to about half of the FPS I would normally get for a solid 10-20 seconds. I tried changing graphics options to lowest (I normally play with every option as high as possible) and even though it reduced the frequency of the FPS drops (or perhaps they were just less noticeable), they still happened. I found this to be quite odd because nothing about my system or game client changed to make this happen, so I could use some advice on locating the issue.

A google search led me to believe that core parking could be the problem, so I tried monitoring my CPU. None of the cores were parked, but whenever a FPS drop hit, my CPU usage went down to about half the usual amount. Is this still core parking or something else going on?

Specs:
GeForce GTX 980M
i7-4710HQ
16GB RAM
Win 10 64 bit
64 bit GW2 client

EDIT: cleaned my fans and game runs well again