Frequent FPS spikes every 5-10 seconds

Hello, recently i have been getting really bad FPS spikes, right around team fights, didnt become a problem until a few months ago and really making it hard to play this game.

Update: I have tried restarting router, release/renewing IP and DNS, reinstalling GPU drivers and nothing seems to be working.

above resolved all problem [GAME STUTTERING], but from lastest windows update december not work