IPhone 6 continues to go to the turning off of the screen and the screen where I enter my access code.

IPhone 6 continues to go to the turning off of the screen and the screen where I enter my access code to return. I hit Cancel on the stop screen or type my password the password screen and it goes back to the screen, I was on. I did a reset, all settings, but not him erase all content and settings. I went all day without any problems and an ago he started to panic. I took the cover of a few days ago thinking it might be the cause of the problem by pressing the power button, that wasn't the problem. Can someone give me some advice on what could be the problem?

I have not updated my phone to the new IOS

Tags: iPhone

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