Index: binaries/data/mods/public/gui/lobby/lobby.js
===================================================================
--- binaries/data/mods/public/gui/lobby/lobby.js
+++ binaries/data/mods/public/gui/lobby/lobby.js
@@ -119,24 +119,33 @@
 	"system": {
 		// Three cases are handled in prelobby.js
 		"registered": msg => false,
-		"connected": msg => false,
+		"connected": msg => {
+			connectedGuiState(true);
+			return false;
+		},
 		"disconnected": msg => {
 
 			updateGameList();
 			updateLeaderboard();
 
-			Engine.GetGUIObjectByName("chatInput").hidden = true;
-
-			for (let button of ["host", "leaderboard", "userprofile", "toggleBuddy"])
-				Engine.GetGUIObjectByName(button + "Button").enabled = false;
-			Engine.GetGUIObjectByName("chatInput").hidden = true;
+			connectedGuiState(false);
 
 			if (!g_Kicked)
+			{
 				addChatMessage({
 					"from": "system",
 					"time": msg.time,
 					"text": translate("Disconnected.") + " " + msg.reason
 				});
+				messageBox(
+					400, 200,
+					""+ g_Username + "\n\n" +
+					translate("The Lobby is disconnect, you want to reconnect?") + "\n",
+					translate("Information"),
+					[translate("Back to Mainmenu"), translate("Reconnect")],
+					[returnToMainMenu, reconnectLobby]
+				);
+			}
 			return true;
 		},
 		"error": msg => {
@@ -403,6 +412,34 @@
 		g_NetMessageTypes[msg.type][msg.level](msg);
 }
 
+function reconnectLobby()
+{
+	if (Engine.HasXmppClient())
+		Engine.StopXmppClient();
+
+	addChatMessage({
+		"from": "system",
+		"text": translate("Reconnect.")
+	});
+
+	// We just use username as nick for simplicity.
+	Engine.StartXmppClient(
+		g_Username,
+		Engine.ConfigDB_GetValue("user", "lobby.password"),
+		Engine.ConfigDB_GetValue("user", "lobby.room"),
+		g_Username,
+		+Engine.ConfigDB_GetValue("user", "lobby.history")
+	);
+	Engine.ConnectXmppClient();
+}
+
+function connectedGuiState(connected)
+{
+	for (let button of ["host", "leaderboard", "userprofile", "toggleBuddy"])
+		Engine.GetGUIObjectByName(button + "Button").enabled = connected;
+	Engine.GetGUIObjectByName("chatInput").hidden = !connected;
+}
+
 function updateLobbyColumns()
 {
 	let gameRating = Engine.ConfigDB_GetValue("user", "lobby.columns.gamerating") == "true";