Fps problem

Hello everyone, I've had this problem for a long time now. Sometimes when i run league and start a game, i am running it at 20-30 fps, with even lower drops. My gpu is not on max clockspeed at all and i don't know how to fix it. When i reboot my pc, and i join the game again it is fixed and i run the game again on 200 fps. I'm running league on a laptop with a gtx 850m and a i7 processor. I hope you guys could help me out with this annoying problem! Thanks in advance, AppelsapFtw
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