I got temp banned for no reason

i was just playing the game normally, then my game got frozen and i decided to restart my pc. I got banned for 1 week last week and it was open i was happy but now i got temp banned again and i dont know how much. Riot please fix your game this is pissing me off so much i cant even play the game normally. i can only play weekends because of school but now i cant because of this no reason bans.