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 +119,26 @@
 	"system": {
 		// Three cases are handled in prelobby.js
 		"registered": msg => false,
-		"connected": msg => false,
+		"connected": msg => {
+			connectedGuiState(true, msg);
+			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, msg);
 
 			if (!g_Kicked)
-				addChatMessage({
-					"from": "system",
-					"time": msg.time,
-					"text": translate("Disconnected.") + " " + msg.reason
-				});
+				messageBox(
+					400, 200,
+					""+ g_Username + "\n\n" +
+					translate("You are disconnected from the Lobby, do you want to reconnect?") + "\n",
+					translate("Information"),
+					[translate("Main Menu"), translate("Stay"), translate("Reconnect")],
+					[returnToMainMenu, null, reconnectLobby]
+				);
 			return true;
 		},
 		"error": msg => {
@@ -403,6 +405,47 @@
 		g_NetMessageTypes[msg.type][msg.level](msg);
 }
 
+/*
+ * Relogin into lobby with known user login credentials from config.
+ */
+function reconnectLobby()
+{
+	if (Engine.HasXmppClient())
+		Engine.StopXmppClient();
+
+	addChatMessage({
+		"from": "system",
+		"text": translate("Reconnecting")
+	});
+
+	Engine.StartXmppClient(
+		g_Username,
+		Engine.ConfigDB_GetValue("user", "lobby.password"),
+		Engine.ConfigDB_GetValue("user", "lobby.room"),
+		g_Username,
+		0
+	);
+
+	Engine.ConnectXmppClient();
+}
+
+/*
+ * Set gui state to connected or disconnected.
+ */
+function connectedGuiState(connected, msg)
+{
+	for (let button of ["host", "leaderboard", "userprofile", "toggleBuddy"])
+		Engine.GetGUIObjectByName(button + "Button").enabled = connected;
+
+	Engine.GetGUIObjectByName("chatInput").hidden = !connected;
+
+	addChatMessage({
+		"from": "system",
+		"time": msg.time,
+		"text": connected ? translate("Connected.") : translate("Disconnected.") + (msg.reason ? " " + msg.reason : "")
+	});
+}
+
 function updateLobbyColumns()
 {
 	let gameRating = Engine.ConfigDB_GetValue("user", "lobby.columns.gamerating") == "true";