Keeps shutting down randomly
I just bought an Iphone 6s plus from a guy on a place like eBay. He said that the screen has been replaced and there is nothing else wrong with it. I came home and the phone suddenly shouted down. I could not turn it on again with the power button so i reset the phone with home and power buttons. It turned on and a couple of hours after, it shutted down again. I had to use same method for turning it on again.
I opened the phone for see the inside and there was a couple of screws missing :(. So it seems to be a very unprofessional guy who was replaced it.
The battery seems to be new and is not bended or damaged. What can it be? I have checked the serial number on apple.com for battery replacement but the serial number is not included in their "battery replacement" program. And the warranty is gone anyway.
The phone goes off randomly. Sometimes in my pocket and other times on the table.
So what can it be? A screew i have too see if it is there?? The new screen??
Is this a good question?