I dont know what happened but please remove my punishment

Today i started a game with amumu as my champion i was even on a rol and then suddenly the game stopped connecting i couldn't reconnect i then left the game to check my internet i then saw it was fine. i do know that if i leave a game that i can enter it again but this time i couldn't even sign in anymore i had to reinstal LoL all over again. i then see that i am marked as a leaverbuster. Please remove this punishment. i do not know what caused the game to disconnect but it wasn't my laptop or my connection that caused it i did a system check afterwards.