Posterize effect on Dell Precision 7520 UHD display

Hello and good day,

Am really happy to get the Precision 7520, it's a beast for my work.

I will like to report an issue I noticed on the display panel.

When watching movies or youtube a video at 4k I get a posterized effect on the low and mid tones.

This won't allow me to have a perfect representation on color and depth of my videos and image.

Please kindly assist me on this issue so I can continue my work.

Also please find attached is an image of what am getting.

Thanks , I will be expecting a reply and fit to this issue