FPS

Huge FPS Drops, usually for around a day and they are gone. My internet is fine and safe to say my PC is the opposite of a toaster, usually I play with around 250 FPS (everything on high). It is not because of the Pool Party event, I have experienced it before, it just somehow fixes itself with me just not playing for a day or when a new patch comes I guess something updates and it fixes itself. Help/Solutions to this dumb thing would be appreciated. I'm sick of losing lane because the enemy or chunks me to half health without me realizing at level 2.