Black texture

Hello,
I have a problem with terrain texture that disappears and reappears in strips.
It looks like black "flying carpets". This happens in both normal mode and VR.
Does anyone have any idea what causes this problem? This happens on all sceneries whether they are designed with aeroscenery or originals (DLC Europe)
Thank you for your help

I reduced the graphic details and no more black textures ... The solution is found _