I have a Moto Z Force Droid. Android Version 7.1.1 w/ 9/1/17 security patch. My phone freezes and goes blank. This started several months ago and has now become more frequent and happens almost daily. It freezes to the point where it cannot be turned back on, even holding down the power button for 10 seconds. Sometimes it freezes on an active screen and other times it just appears with a black screen, like it is powered off. In both instances holding down power does not reset it. I just have to wait until it turns back on. Sometimes it will pick up on the screen where it froze, even from a black screen, sometimes it restarts. This has happened when I am using the phone on a phone call or searching for something and has happened when the phone is not in use at all. The phone has never felt like it was overheating. It happens when it is not plugged into a charger, but it has always been between 75%-90% charged. My phone has also started deleting pictures that have been sent to me via text. The rest of the text messages appear, but the pictures are missing. Usually with a blank/empty text frame. This can happen a couple of days after the text was sent or longer. This is becoming a major problem, as I often work remote and need a dependable phone.