Game lags way to much,especially the fps drops

Im having a lot of problem to play the game ,its not every time , but after some games ,the games starts to lag to much ,the fps drops,not just during matches, but even in the menus,to the point that i have to quit to make it playable again.Pls help me fix this issue or at least refund me the game cause i cant play this game if this problem continues.