Terrible triangular artefacts on iOS.

Terrible triangular artefacts on iOS in the simplest scene on the best quality.

And the better quality in project settings - the worse are the artefacts. They are flickering when camera moves (around the object).

Please help to determine the problem. I think it’s something with lightmap resolution or lighting settings…

What could that be and why on iOS?
58895-2015-11-28-005627.png

58896-2015-11-27-234423.png

It was low shadow resolution and too far shadow distance.