I had a problem with league of legends

I had a problem where my game crashed during the champions loading screen saying I had no internet I closed it and restarted the game and said I had a file deleted I repaired the game and rejoined and after the game was over I had a thing saying I something about being afk and that If I do it again i will be banned which I think it's unfair because the game some how had a file missing which I don't think it was the case needs some investigation into the matter please find a fix