So recently, for about a month now my p8 screen misbehaves in weird way, i was not able to find a matching issue online, so as last hope for an answer posting here.
I cannot corelate this to any update since they are seemless, but for the info im on stable channel.
Screen changes its brightness by itself, momentarily goes dimmed and back. I can reproduce the issue anytime easily by opening a context menu while in any app, so the opened menu takes the focus and "background" is where the fun starts, it spontaneously changes the brightness. I mean it goes dimmed, then back to full brightness, either by itself or sometimes triggered by touching the screen. The screen record feature cant capture the events, on the footage everything looks normal. It kind of feels like something going on with proximity sensor, but not to a complete off, only to a dimmed state.
Any screen settings, accessibility e.g. animations, extra dim, nothing seems to impact the crazy behavior. Hard reset dont help, with or without restoring from past system, only changed some security privacy setting after reset, same as always before. Nothing crazy.