FG management crash VDOM

Hello,

I'm running 2x FG100D 5.2.4 in HA (A-P) and primary's unit CLI/ WEB GUI management has crashed again. Its possible to login into WEB GUI or CLI within global mode, but if I want to enter VDOM management it stucks and nothing happens (Error 500 in web).If I want to show "config system global" also noting happens.

The slave unit is under control (VDOM mng is working). When it happened for the first time, I tried to restart the unit from CLI but nothing happened. Physical shutdown and power on was needed. 

Does anyone have the similar problem ?