LG G4 :: Phone Suddenly Quits App And Starts Another

I have a issue with my LG G4. When i use chrome or different apps on my G4, then suddenly the phone quits the app and starts another. It is tapping by its own on random links when i am on chrome etc. without me touching the screen. To provoke og trigger the effect, i can start the Antutu touch screen test. When i touch the screen with sometimes only 3 fingers,then the it goes completely mad. It begins tapping all over the screen, and it then quits the Antutu app and starts alot of other apps and it just keeps on doing the random tapping until i stop touching the screen. After this i go to the chrome app and start reading an artical, then suddenly it taps on links og quits chrome.