Hi there! I tried to find a post about exactly what I experience with my iPhone XS Max, but I am not sure the related posts are about the very same issue. Besides issues with flickering screens on several conditions, what I can't fix no matter what I do is a kind of oscillating brightness on the screen when I'm laying in bed at night, all lights off. It's a subtle, but noticeable, increase and decrease in the perception of brightness, like a pulsating backilight, which of course can't be, since it's an OLED screen. It never stops, that's why I call it "oscillating". I tried most combinations of enable/disable Auto-brighness, Reduce White Point, Night Shift and True Tone and the issue remains. If I had to guess, I'd say it's either a malfunctioning sensor that controls brightness regardless of the Auto-brightness settings, or that at very low levels of brighness the screen can't achieve a stable level of light emission and the eye is sensible enough to notice it. Anyone has the same issue with their iPhone? Thoughts? Fixable via software updates? Cheers!