Fps droping

Hello guys i have one problem but its start after 7.22 clinet update this is what heppened: When i start sumoner rift blind pick or ranked 5v5 after 5 minut plying game fps drop to 20 or less and sty unitly end of game then i think is my driver or my laptop but its wrong i start aram and future game fps was stable all game and any game of that but just 5 v5 blind its droping almost to 0 any sulution?
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