Seems I have some problems with my setup stability. Setup is as below:
2. 5 groups of lamps, from 2 up to 5 lamps per group(total 21 lamp). Each lamp has its own dimmer(Qubino). Each lamp can be dimmed separately from HC3 without any problems.
3. Each group of lamps has its own dimmer(Fibaro dimmer 2) with monostable switch(on/off, held for dimming, 2 times click for max). Qubino dimmers are controlled through Fibaro dimmer associations.