TCL TV black screen issue during transitions

Hello,

I own a TCL 50EP640 TV that I purchased brand new a few days ago. Everything works well except for an issue during fade-to-black moments that "turns off" the screen.

Let me explain, imagine I'm watching a Star Wars movie, between the moment when the text "a long time ago..." appears and the title comes up with the music, there is a black screen. During this brief black screen, the backlight of the TV completely shuts off, whereas normally even if the displayed image is black, it stays lit. It gives the impression that the TV is being turned off and then turned back on right afterward, which is quite disturbing when watching a film.

I’m using a Samsung Blu-ray player and a PS4, and the problem is present on both.

I called TCL, but they just told me to reset to factory settings, which had no effect. Moreover, I feel like they’re not listening when I explain my issue. I will call them back, but I feel like I would have a better chance of getting some attention and answers by asking here.

So thank you in advance if you have any suggestions.

Best regards.