[Gameplay Bug] FPS Loss at Random Intervals

I have been having issues since roughly the beginning of Patch 6.2 where at unpredictable intervals I will lose a small number of frames (going from whatever cap setting down to 1-20 or so for just one second or so), then go back to normal. I have tested it with uncapped FPS rate, 144 cap, and 60, on both maximum quality and lower settings, with any of these it will happen. There is no change in ping during these instances, I stay at a stable 26 or so. If I click during the frame drops usually the command to move, attack, etc will not go through. I run the game on an EVGA GTX 970 Superclocked graphics card, with no shortage of CPU power or RAM. Pretty annoying bug to have happen, as it often prevents me from simple trading all the way to surviving fights. Sometimes restarting my computer will solve it for a while, but restarting just the client will not. I've seen this on other players machines as well, including some streamers who have noticed it during games. Not sure the cause, it could be on my end but I've checked everything I know of. I have no way of reliably reproducing this unfortunately, which I know makes it harder to identify.