Walking without clicking

Whenever I play league, at least once per 3 games, my character would walk randomly to a place where I DID NOT CLICK. In games such as ARAM, people would think I'm trolling and feeding and I get reported for these types of "behaviors". In reality, I have NO control over it no matter what I do. The only thing I can prevent from "feeding" is to disconnect/close the game so my character walks back to the base fountain. Also during these episodes, my internet runs fine and the only thing that is not fine the League.