Had an issue where the screen kept going black then back the the lock screen. Even if I unlocked the device is would keep locking itself back. It did this until the phone rebooted itself.
I do not have good lock and it's happening to me as well. It seems only happen when I am attempting to play an imbedded video file. But not ALL imbedded videos. If I click on a video on a web page, sometimes it will go into a weird loop where the screen shuts off, comes onto the lock screen, and screen shuts off again. I have to manually hold the volume down and power to reboot. Once I reboot, phone goes back to normal until it happens again by clicking an embedded video
I'm also getting random lock screen. I'm either playing a game, watching a video, or browsing the web. Then unexpectedly the phone locks and shows the lock screen. The apps are still where I left off, I just have to unlock
