Possible bug

Sometimes when I'm playing (hero or trooper, more often trooper) i will be looking around and then my character will turn more that they need to if i look around for to long. Like i will be running and then my character will look to the left or right as if you moved the joystick once with 50% sensitivity (i use 25%) this is not stick drift because it doesn't happen on any other game. Does this happen to anyone else?