U2718Q, too dark during dark parts of videos

The U2718Q also does this. I cannot watch Netflix on my expensively purchased 4K display. I regret choosing this monitor as my previous 4K Asus PB287Q performs better. This is just more "good looking" with the borderless design. But not so usable for watching media. I'm recording a YouTube review on my YouTube channel comparing this display with other 4K models and this has came with a lower score.