I own a 65" LG 4K 3D OLED, and, as others have discovered, the set has been manufactured to automatically dim the picture (to prevent burn-in, they said) whenever an image remains unchanged for too long a time. But it does more than that... it dims down already dark scenes even if the image changes, until a strong light source appears, at which time it suddenly regains its proper brightness. This is incredibly annoying. I saw THE LIGHTOUSE locally a few weeks back, and I am pretty sure it will get a Blu-ray release. I would like to buy it, but I doubt I'd have a pleasant viewing experience watching it on this otherwise beautiful display. The movie is loaded with very dimly-lit scenes -- in fact, only a few take place in broad daylight or brightly-lit interiors. I think I'd be wasting my money. LG posted a response to complaints about this, and there appears to be no user correction possible. I've tried, using every setting in the book. The company simply said, "We'll look into it for future models." Great $2,000 spent and I almost certainly can't properly watch THE LIGHTHOUSE. Anyone else in this boat?