I upgraded from an 8+ to the XS last week. I have had the phone for about 4 days. Today I was looking at some images I took over the weekend and noticed flickering in an area of the image (clouds). It wasn’t constant and regular.. it was irregular and kind of pulsed every once and a while. I have sinned noticed in in the setting menu. I have not had any headache issues. It looks like the screen is having trouble ‘holding’ a brightness or TT level. Anyone else?