What Are The Causes For "Notice: Server Disconnected" On Game Restart?

[Deicide]

Yep. Basically when the code map_restart(false); or map_restart(true); is used, the game freezes for about 3 seconds then it cuts back to the main multiplayer screen saying "Notice: Server Disconnected". I have no idea what is causing it. But my menu script is being used. So surely it's a problem with that. But i'm unsure about where to begin.