回答“note 3 turns off by itself”I have the same issue with my note 3. But sometimes when I turn my on, a rainbow of colors comes up like a glitch and it won't turn on. My screen is fine and I have had it taken in and of course it wouldn't do it then. But it only started happening after the update that came out in early to mid January of this year. I was convinced it was either the phone or the update.