We recently purchased a UE55NU tv and having the same issue. We watch tv in a dark room all the time and all dark scenes in any HDR content has changing/flickering brightness. So annoying we avoid HDR content and go for Full HD insteaf. Wish there was Full HD tvs to buy still at 55” but had to go UHD. The tech on samsung just doesnt seem ready for it. Turning off subtitles helps a little but with them on its crazy. Everytime a sub i displayed, the brightness jump up drastically to then just drop as soon as text dissapears. The theory it being the sensor reacring to the light in the room makes sense. As an example, found The Ranch Part5 on Netflix that is HDR content with many dark scenes. Utterly unbarable to watch on the TV. So was The Ozark on Nerflix in HDR. Please fix the software and providenan update ASAP.
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