Redundant SCADA Servers SCX6

I have a problem with 3 redundant SCX6 servers (A,B,C): there are often unknown failure of servers (A and B) which is located together and the third server (C), which is remote from another two servers, gets "Main" status! That situation causes loss of view on stations, which is directly connected to A and B Servers, and I need to shut down Server C so the "MAIN" functionality returns to Server A or B. Please, contact if you have any ideas about possible reasons of that problem!!!

Thanks,
DCS Engineer

Email: [email protected]
ICQ #291-348-107