On an iPhone 8 Plus and after updating to iOS 11.2 randomly the lock screen will only show the status bar stuff and the wallpaper. No notifications, widgets, and can’t ever slide for the camera. Closing apps, pulling down the notification bar results in the same behavior, holding the lock screen key on the side and waiting for power menu then holding home to clear something up does nothing to fix, no matter what I do I can’t correct it without a reboot. ♂️