iPhone 6 Plus is possessed!!!

Hello, since le last 3 days my 6 plus screen all of a sudden starts to flicker (the top of the scree) and it does not respond to touch. It blocks all manual input and it starts to perform functions on it's own. It types and moves from app to app. The only way to stop it is force it to shut down. It has not fallen or fell into water..

It's possessed!!!! HELP!!!!!!