Huge FPS drop around 6-10 min

This problem happens for me around 6-10 min and at that time i get 0 fps for like 30-40 sec than it goes back to working normally 60-120 fps i tried to cap fps,lower settings,repair client, reinstall game nothing helps.My game was working fine last time i played in December during Nexus Blitz i didn't get fps drop like this, now i started ranked and its really painful to play with this when i get that 1 drop around 6-10 min most of the time i die or don't help my team because my game is frozen with 0 fps for like 30 sec and after that goes to working normal, its been almost 1 week with this and i don't know what to do....
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