FPS drops on Ryzen for no reason

Has anyone else been having issues with their FPS dropping by a considerable amount for no reason? I'm playing on a laptop with a Ryzen 2700U and usually get between 80 and 130 FPS in-game (the lower end being in team fights with Miss Fortune ult going off or something). Recently, I've had my FPS drop as low as 10 for a few moments, but for some reason it only seems to happen pre 5 minutes, and after that I don't go below 80 FPS for the remainder of the game. Anyone have any idea what's going on? I've tried updating my drivers, reinstalling league, and decreasing and increasing my graphics settings but the same issue happens pretty much every single game until 5 minutes.
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