When I'm watching a movie on my 49 inch Sony X800D the backlight turns off when the scene is all black, usually during a scene transition or fade to black. This isn't the backlight dimming from Advanced Contrast Enhancer the tv backlight is literally turning off during 1-2 second black screens. This only happens when the screen is completely black.

I don't know what is wrong. Advanced Contrast Enhancer is off, all eco and power savings are off. I even enabled developers mode to set screen to stay awake and that doesn't even work. It's gotta be something else

Does anyone else with this tv notice this problem? It's been bugging me like hell and hopefully someone here can help me out.

I have the IPS 49inch X800D just to clarify. I previously had a 2015 x800c which didn't have this problem, i do understand they are different models.