Random fps drops to 30

[woahbust]

I am playing Super Monkey Ball Gaiden on dolphin with windows 10, nvidia 1050 Ti gpu, and an intel i-5 cpu, more than enough to run this Gamecube game smoothly at 60 fps; However seemingly for no discernable reason, the game drops to almost exactly 30 for multiple seconds and then a few seconds later starts running at 60 again. I tried looking this problem up but only found general solutions for lag, but this problem doesn't seem to be based on my computer not being powerful enough and is too consistent for it to reasonably be incidental lag. Does anyone have any possible solutions to this problem or insight? Thanks!