I don't know how to make it simplier and which (if) objects casues the problem. Please verify problem with rendering on this file. As I said - problem happens on random frames and random time and different tiles are missing at the same frame rendered few times - it means I can render the same frame with different (good or bad) result without changing anything so I really don't know what causes the problem and what not delete

right, I forgot about hdr texture for environment. I used this one attached here. I'm not sure - how to simplify this .blend file ?

ok, here is upload