Recently I got one of 3CX Phone System 12 services (Media Server service) stop working suddenly. I don't know why this is happened. The first solution I had in my mind was restarting the all services. But after some minutes Media Server Service fall down. So the second solution I had in my mind was restarting Windows Server. Then all services start working. Until now, this issue has occurred three times. If I check into 3CXSvrStarter log file, I can find some exception that said "System.InvalidOperationException". I attach that log file if you guys want to look more detail. I really appreciate any feedback. Thanks!