every time i submited scene to render farm, few frames were rendered incorectly.
after wasting lot of time and money, I come to a conclusion that in scenes that are big (exterior visualisations) there can not be polygons that are too big or render node will somehow skip them.
every time 5 frames and each node was rendering by 5 frames. so it could be just some other problem
could be caused possibly also by fallof map with camera distance and huge numbers
another thing is inconsistent lighting
I got different results using my pc as oppose to render farm... few textures were brighter
could be caused possibly also by fallof map with camera distance