This keeps happening to me

I keep having trouble with my game. I keep getting a leaver buster for no reason. so now i have five 20 minute leaver busters because "i went AFK in a game" which i did not. In the game i did not leave once and i did not get a reconnecting bar once and it gave me a leaver buster at the end of the game and i really want it gone. CAN I GET SOME HELP PLEASE? This is making the game literally not fun at all and making it a bad time for me..