[CrossUSAAF]

In this case I Recommend you to download "native server checker" and and look, what's actually happening, when your game mode is changing. When you have done your check, please post here your "server_log.txt" file copy.

And can you please tell me, are you hosting in home, or company? I'm just thinking, if your server got overloaded.

Have you tried to restart your game mode with RCON GMX command?