Infinite Loading Screen (Stuck at 100%)

Exactly as the title says. I enter a game, select the campion and it starts normally. But when the loading screen reaches 100% the wheel on the top left corner just spins endlessly and i can't get in the game. After 5 mins it goes to the post-game lobby and gives me a leaver penalty and a significant decrease in lp. I have already checked and the rest of my pc works at a normal speed and so does the internet, so the problem resides in league alone. This usually happens everytime i start the launcher so i end up losing a game on every league session because i can't even enter. Has anyone encountered a similar problem or knows a fix? Thanks in advance!{{summoner:31}}
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