Lightmap flickering

Hi,
Sorry for my english…
I have a problem, pls help me. I baked lightmaps many times since the begining of project, closing and re-lunching UE4, but they are still flashing when I moving around the scene. It looks like it comes off second UV channel for lightmap, and then to correct it.

Someone knows somethign about this? pls

…necessary to increase value streaming poolsize