LeaveBuster

I was in Queue with my friend, everything was good, we got into champ selection and picked our champs, then right before it start it my league screen went black i thought it was normal because it does that every time before the loading screen, me and my friend were in discord, and he told me to look at his twitch skin I was like i cant my league is black, then the game started i was worried and closed the client and tried to reconnect my self, then my team remakes and i get a leave buster ban for 20 min, THAT'S SOOOOO UNFAIR LEAGUE OF LEGENDS STAFF CONTACT ME IMMEDIATELY, ITS THE 3RD TIME I'M ALMOST DONE WITH LEAGUE BRO ITS SOOOOOOOO UNFAIR AND ITS ANNOYING TO WAIT 20 MIN BEFORE EVERYMATCH