diff --git a/Scripts/monitors.py b/Scripts/monitors.py
index e129b14..75c5565 100644
--- a/Scripts/monitors.py
+++ b/Scripts/monitors.py
@@ -77,6 +77,12 @@ class TemperatureMonitor(Monitor):
         
         temp = list(temps.values())[0]  # Get first temp reading
         
+        # ===== ADD THIS: Validate temperature is reasonable =====
+        if temp < -50 or temp > 150:  # Sanity check (outside normal range)
+            print("⚠️ Warning: {} sensor returned invalid temp: {:.1f}°F".format(self.label, temp))
+            return  # Don't cache invalid reading
+        # ===== END: Validation =====
+        
         # Cache the reading for web server (avoid blocking reads)
         self.last_temp = temp
         self.last_read_time = current_time
diff --git a/config.json b/config.json
index 1673f7c..bb64f8c 100644
--- a/config.json
+++ b/config.json
@@ -32,5 +32,6 @@
         }
     ],
     "schedule_enabled": true,
-    "permanent_hold": false
+    "permanent_hold": false,
+    "temp_hold_start_time": null
 }
\ No newline at end of file
diff --git a/main.py b/main.py
index e87723c..c49f8b4 100644
--- a/main.py
+++ b/main.py
@@ -376,20 +376,8 @@ while True:
         # Web requests
         web_server.check_requests(sensors, ac_monitor, heater_monitor, schedule_monitor, config)
 
-        # ===== RETRY NTP SYNC (if initial failed) =====
-        if not ntp_synced and retry_ntp_attempts < max_ntp_attempts:
-            if time.time() % 10 < 1:  # Every 10 seconds
-                if sync_ntp_time(TIMEZONE_OFFSET):
-                    ntp_synced = True
-                    last_ntp_sync = time.time()
-                    print("NTP sync succeeded on retry #{} (UTC{:+d})".format(retry_ntp_attempts + 1, TIMEZONE_OFFSET))
-                else:
-                    retry_ntp_attempts += 1
-                    print("NTP retry {} failed".format(retry_ntp_attempts))
-        
         # ===== PERIODIC RE-SYNC (every 24 hours) =====
-        # Re-sync once a day to correct clock drift
-        if ntp_synced and (time.time() - last_ntp_sync) > 86400:  # 24 hours in seconds
+        if ntp_synced and (time.time() - last_ntp_sync) > 86400:
             print("24-hour re-sync due...")
             if sync_ntp_time(TIMEZONE_OFFSET):
                 last_ntp_sync = time.time()
@@ -397,8 +385,15 @@ while True:
             else:
                 print("Daily NTP re-sync failed (will retry tomorrow)")
         # ===== END: PERIODIC RE-SYNC =====
-        # Enable garbage collection to free memory
-        gc.collect()
+        
+        # ===== ADD THIS: AGGRESSIVE GARBAGE COLLECTION =====
+        current_time = time.time()
+        if int(current_time) % 5 == 0:  # Every 5 seconds
+            gc.collect()
+            # Optional: Print memory stats occasionally
+            if int(current_time) % 60 == 0:  # Every minute
+                print("💾 Memory free: {} KB".format(gc.mem_free() // 1024))
+        # ===== END: AGGRESSIVE GC =====
         time.sleep(0.1)
         
     except KeyboardInterrupt: