camera is stuck

you know how when its the beggining of a game the camera is locked on your champ? well that sucks so youput it to free cam. but when you want to find ur champ ur click the button on ur keyboard that temporarily sets fixed cam, but is SUPPOSED to release when u let go of that button, well for me its started locking it on instead and i cant get it off until i die. even when i click the button attacthed to the mini map! this has gotten me killed multiple times and even lost matches or me. needs to be fixed