diff --git a/static/js/modes/meshtastic.js b/static/js/modes/meshtastic.js
index e017ad1..dba40ee 100644
--- a/static/js/modes/meshtastic.js
+++ b/static/js/modes/meshtastic.js
@@ -16,8 +16,9 @@ const Meshtastic = (function() {
 
     // Map state
     let meshMap = null;
-    let meshMarkers = {};  // nodeId -> marker
-    let localNodeId = null;
+    let meshMarkers = {};  // nodeId -> marker
+    let localNodeId = null;
+    let clickDelegationAttached = false;
 
     /**
      * Initialize the Meshtastic mode
@@ -32,11 +33,14 @@ const Meshtastic = (function() {
     /**
      * Setup event delegation for dynamically created elements
      */
-    function setupEventDelegation() {
-        // Handle button clicks in Leaflet popups and elsewhere
-        document.addEventListener('click', function(e) {
-            const tracerouteBtn = e.target.closest('.mesh-traceroute-btn');
-            if (tracerouteBtn) {
+    function setupEventDelegation() {
+        if (clickDelegationAttached) return;
+        clickDelegationAttached = true;
+
+        // Handle button clicks in Leaflet popups and elsewhere
+        document.addEventListener('click', function(e) {
+            const tracerouteBtn = e.target.closest('.mesh-traceroute-btn');
+            if (tracerouteBtn) {
                 const nodeId = tracerouteBtn.dataset.nodeId;
                 if (nodeId) {
                     sendTraceroute(nodeId);
diff --git a/static/js/modes/sstv.js b/static/js/modes/sstv.js
index ca8e34a..c7b5d25 100644
--- a/static/js/modes/sstv.js
+++ b/static/js/modes/sstv.js
@@ -14,10 +14,11 @@ const SSTV = (function() {
     let issMarker = null;
     let issTrackLine = null;
     let issPosition = null;
-    let issUpdateInterval = null;
-    let countdownInterval = null;
-    let nextPassData = null;
-    let pendingMapInvalidate = false;
+    let issUpdateInterval = null;
+    let countdownInterval = null;
+    let nextPassData = null;
+    let pendingMapInvalidate = false;
+    let locationListenersAttached = false;
 
     // ISS frequency
     const ISS_FREQ = 145.800;
@@ -92,10 +93,12 @@ const SSTV = (function() {
         if (latInput && storedLat) latInput.value = storedLat;
         if (lonInput && storedLon) lonInput.value = storedLon;
 
-        // Add change handlers to save and refresh
-        if (latInput) latInput.addEventListener('change', saveLocationFromInputs);
-        if (lonInput) lonInput.addEventListener('change', saveLocationFromInputs);
-    }
+        if (!locationListenersAttached) {
+            if (latInput) latInput.addEventListener('change', saveLocationFromInputs);
+            if (lonInput) lonInput.addEventListener('change', saveLocationFromInputs);
+            locationListenersAttached = true;
+        }
+    }
 
     /**
      * Save location from input fields
diff --git a/static/js/modes/weather-satellite.js b/static/js/modes/weather-satellite.js
index 1489aa5..c12eb90 100644
--- a/static/js/modes/weather-satellite.js
+++ b/static/js/modes/weather-satellite.js
@@ -27,11 +27,24 @@ const WeatherSat = (function() {
     let consoleAutoHideTimer = null;
     let currentModalFilename = null;
     let locationListenersAttached = false;
+    let initialized = false;
 
     /**
      * Initialize the Weather Satellite mode
      */
     function init() {
+        if (initialized) {
+            checkStatus();
+            loadImages();
+            loadLocationInputs();
+            loadPasses();
+            startCountdownTimer();
+            checkSchedulerStatus();
+            initGroundMap();
+            return;
+        }
+        initialized = true;
+
         checkStatus();
         loadImages();
         loadLocationInputs();
@@ -39,14 +52,6 @@ const WeatherSat = (function() {
         startCountdownTimer();
         checkSchedulerStatus();
         initGroundMap();
-
-        // Re-filter passes when satellite selection changes
-        const satSelect = document.getElementById('weatherSatSelect');
-        if (satSelect) {
-            satSelect.addEventListener('change', () => {
-                applyPassFilter();
-            });
-        }
     }
 
     /**
diff --git a/templates/index.html b/templates/index.html
index 6b6a320..988aae2 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -4386,8 +4386,11 @@
             }
         }
 
+        let modeSwitchRequestId = 0;
+
         // Mode switching
         async function switchMode(mode, options = {}) {
+            const requestId = ++modeSwitchRequestId;
             const { updateUrl = true } = options;
             const switchStartMs = performance.now();
             const previousMode = currentMode;
@@ -4457,6 +4460,7 @@
             const stopPhaseMs = Math.round(performance.now() - stopPhaseStartMs);
             await styleReadyPromise;
             await scriptReadyPromise;
+            if (requestId !== modeSwitchRequestId) return;
 
             // Generic module cleanup — destroy previous mode's timers, SSE, etc.
             if (previousMode && previousMode !== mode) {
@@ -4465,6 +4469,7 @@
                     try { destroyFn(); } catch(e) { console.warn(`[switchMode] destroy ${previousMode} failed:`, e); }
                 }
             }
+            if (requestId !== modeSwitchRequestId) return;
 
             currentMode = mode;
             document.body.setAttribute('data-mode', mode);
@@ -4480,6 +4485,7 @@
                 // Sync with local status
                 syncLocalModeStates();
             }
+            if (requestId !== modeSwitchRequestId) return;
 
             // Close dropdowns and update active state
             closeAllDropdowns();
@@ -4799,6 +4805,7 @@
             } else if (mode === 'ook') {
                 OokMode.init();
             }
+            if (requestId !== modeSwitchRequestId) return;
 
             // Waterfall destroy is now handled by moduleDestroyMap above.