Issues with the game

So my pc runs league pretty good, on high settings it stays on the 60 fps cap and the client runs pretty well too. The deal is that one day suddendly my fps started drop in an unusual rate i mean sometimes its used to drop to like 50 fps at heavy team fights, but they started to drop at 30 even 15 sometimes. But now everything is out of hand i cant play anymore i changed league to low settings and even the client on low spec, but the performance of the game its getting worse and worse, the game is running to like 20 fps and having drops of 5, 3 and sometimes 0 fps, the client its totally nuts its running slow and since all this started my in game settings (buttons, hotkeys, etc) are all weirded up, for example my camera lock is on the "Y" button but for some reason the command doesnt respond when i hit "Y" and when i manually unlock the camera it just drags to the upper part of the map. I cannot play anymore and i dont understand why. The performance on my pc its been the same as always tho, the only issue i have its with lol. (Havent played another game yet to make sure its only league)

All help i can get will be apreciated.

• Edit: I already tried with the repair tool on the client and unistalled and installed the game but to my opinions things just got worse after that.