I mentioned in the first post that it's a Flash Forge Creator Pro, 2015 model. It has printed almost 1000 meters and I guess that it needs some service.
I didn't write a lot of information because we tested all possible settings in Simplify3D. We also have custom PID and JKN values.
Was hoping that someone else with FFCP had printed something similar (hollow cylinder) with same point for layer change and was curious if this effect appeared.