Problems with shadows

A strange thing happens to my object, black spots appear on it, which move when the day changes. You can see sometimes they are “pixelated”.
The only thing I realized is that it’s all about the material.

try to tweak the lightmap uv or increase the lightmap resolution

I think he’s using dynamic lighting…

I would have 2 guesses:
Are you using DFAO?
Maybe it’s the reflecion, the way you’ve placed your reflection captures?

It didn’t help

Hi! There are no Sphere reflection capture on my stage (if you are talking about them)
I also did everything with Distance Fields Ambient Occlusion. But it doesn’t help