Hi guys,
problem effectively was just known “port flapping on ports 6-10” (from ROS 6.36.rc20 renamed switch 2, finally) you can see topics here http://forum.mikrotik.com/t/port-flapping-ether6-link-down-up-on-rb3011uias-rm/95195/1 and here http://forum.mikrotik.com/t/port-flapping-ether6-link-down-up-on-rb3011uias-rm/95195/1
We solved only through a new official OS by Netinstall http://wiki.mikrotik.com/wiki/Manual:Netinstall and after updating (as e-mail received from support) to last RC version. Only now there are residual re-login of customers group, but it appear without a specific cluster. But since we use UBNT Rocket at moment (https://www.ubnt.com/airmax/rocketm/) we need to investigate if there is caused by them or what other.
P.S. host section was empty because that ports on RB3011 are not software bridged nor setted as master/slave (as you can see on previous screenshot there are 9xISP and 1xLAN with PCC). We are sure now of no failure for it because tested on an older RB1100AHx2
Thanks