iphone won't wake from sleep.

Hi,

My iphone 6 plus started to do something really annoying.

It works fine except that if it turn in sleep mode (automatically or with sleep button) it will never wake with home or wake/sleep button.

The screen remains black but if I plug it to a computer, it will connect to it so I know it's still powered on.

The only thing I can do then is hold both buttons until it restarts.

I tried:
- to remove sim card
- to update
- to restore
- to dfu restore
- to set as a new iphone
- to restore from a backup

I tried everything but nothing works.

Please help me!!

Thanks.

Hi there Ales,

If it's not needing a charge, and considering all you've done already I would take it to the Apple store or to an authorized Apple repair shop. Especially if you're warranty is still good.