Carrier and does this only happens when you are on a phone call?Subject says it. It's not locking with power button, just timeout. Any ideas? //uploads.tapatalk-cdn.com/20170827/16e2effd52aa51c00b41f10e71097801.jpg
If i hit power button, screen turns off, wait a few seconds, hit power button, homescreen wallpaper appears, swipe up, phone unlocked.
Carrier and does this only happens when you are on a phone call?
If it happens all of the time and not just when on a phone call, it could be:
-trusted place
-trusted Bluetooth device
-maybe on body detection or something similar that is not functioning properly.