hi folks, tonight while watching youtube my j600fn went off and came back on with a black screen only displying the top of the phone (white text battery time wifi etc.)
after a while the screen would look normal but not showing face recognition icon or touch screen not working. holding power button will only bring up power off and reset. when pushed the phone will appear to go off but pushing power button again would bring me back to black screen with white text
i held the power button for 1 minute the phone powered off and vibrated so i turned the phone on now showing samsung logo started up normally. entered in password and the phone popped up "system ui not responding"