Blinking black areas on landscape

Development Rendering
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1

I have a lot of blinking black areas on landscape (screenshot 1). If I look right from the top, there aren’t any of them (screenshot 2). It happens in viewport, in PIE and in Launch mode too.
Using MacBook Pro 13 2017 with Intel Iris Plus Graphics 640.

218350-screen-shot-2017-10-30-at-32020-am.jpg
218350-screen-shot-2017-10-30-at-32020-am.jpg3104×1826 967 KB

218364-screen-shot-2017-10-30-at-34335-am.jpg
218364-screen-shot-2017-10-30-at-34335-am.jpg3104×1826 938 KB

2

hm… that usually happens if you need to rebuild your lights.

3

Doesn’t work. These are not static shadows. It happens even on a flat landscape.

4

same problem i have