diff --git a/providers/spot/dxcluster.py b/providers/spot/dxcluster.py
index eb537df..7ff26bb 100644
--- a/providers/spot/dxcluster.py
+++ b/providers/spot/dxcluster.py
@@ -1,7 +1,7 @@
 import logging
 import re
 from datetime import datetime
-from threading import Event, Thread
+from threading import Event, Lock, Thread
 
 import pytz
 import telnetlib3
@@ -40,6 +40,7 @@ class DXCluster(SpotProvider):
             self._LINE_PATTERN_ALLOW_RBN if self._allow_rbn_spots else self._LINE_PATTERN_EXCLUDE_RBN
         )
         self._telnet = None
+        self._telnet_lock = Lock()
         self._thread = None
         self._stop_event = Event()
 
@@ -49,8 +50,9 @@ class DXCluster(SpotProvider):
 
     def stop(self):
         self._stop_event.set()
-        if self._telnet:
-            self._telnet.close()
+        with self._telnet_lock:
+            if self._telnet:
+                self._telnet.close()
         if self._thread:
             self._thread.join(timeout=15)
             if self._thread.is_alive():
@@ -63,7 +65,14 @@ class DXCluster(SpotProvider):
                 try:
                     self.status = "Connecting"
                     logger.info(f"DX Cluster {self._hostname} connecting...")
-                    self._telnet = telnetlib3.Telnet(self._hostname, self._port)
+                    new_telnet = telnetlib3.Telnet(self._hostname, self._port)
+                    with self._telnet_lock:
+                        self._telnet = new_telnet
+                        if self._stop_event.is_set():
+                            # stop() was called while we were connecting, close the connection rather than trying to
+                            # read when we know it won't work
+                            new_telnet.close()
+                            break
                     self._telnet.read_until(self._login_prompt.encode("latin-1"))
                     self._telnet.write(f"{self._login_callsign}\n".encode("latin-1"))
                     connected = True
diff --git a/providers/spot/rbn.py b/providers/spot/rbn.py
index 7923b9e..28b3261 100644
--- a/providers/spot/rbn.py
+++ b/providers/spot/rbn.py
@@ -1,7 +1,7 @@
 import logging
 import re
 from datetime import datetime
-from threading import Event, Thread
+from threading import Event, Lock, Thread
 
 import pytz
 import telnetlib3
@@ -29,6 +29,7 @@ class RBN(SpotProvider):
         super().__init__(name, provider_config)
         self._port = provider_config["port"]
         self._telnet = None
+        self._telnet_lock = Lock()
         self._thread = None
         self._stop_event = Event()
 
@@ -38,8 +39,9 @@ class RBN(SpotProvider):
 
     def stop(self):
         self._stop_event.set()
-        if self._telnet:
-            self._telnet.close()
+        with self._telnet_lock:
+            if self._telnet:
+                self._telnet.close()
         if self._thread:
             self._thread.join(timeout=15)
             if self._thread.is_alive():
@@ -52,7 +54,14 @@ class RBN(SpotProvider):
                 try:
                     self.status = "Connecting"
                     logger.info(f"RBN port {self._port!s} connecting...")
-                    self._telnet = telnetlib3.Telnet("telnet.reversebeacon.net", self._port)
+                    new_telnet = telnetlib3.Telnet("telnet.reversebeacon.net", self._port)
+                    with self._telnet_lock:
+                        self._telnet = new_telnet
+                        if self._stop_event.is_set():
+                            # stop() was called while we were connecting, close the connection rather than trying to
+                            # read when we know it won't work
+                            new_telnet.close()
+                            break
                     self._telnet.read_until("Please enter your call: ".encode("latin-1"))
                     self._telnet.write(f"{SERVER_OWNER_CALLSIGN}\n".encode("latin-1"))
                     connected = True
diff --git a/templates/add_spot.html b/templates/add_spot.html
index 1ac1058..b629870 100644
--- a/templates/add_spot.html
+++ b/templates/add_spot.html
@@ -77,7 +77,7 @@
 
 </div>
 
-<script src="/static/js/add-spot.js?v=1789763826"></script>
+<script src="/static/js/add-spot.js?v=1789800912"></script>
 <script>$(document).ready(function () {
     $("#nav-link-add-spot").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/alerts.html b/templates/alerts.html
index fed4253..a3b58e0 100644
--- a/templates/alerts.html
+++ b/templates/alerts.html
@@ -83,7 +83,7 @@
 
 </div>
 
-<script src="/static/js/alerts.js?v=1789763826"></script>
+<script src="/static/js/alerts.js?v=1789800912"></script>
 <script>$(document).ready(function () {
     $("#nav-link-alerts").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/bands.html b/templates/bands.html
index fd234cc..dc7a4df 100644
--- a/templates/bands.html
+++ b/templates/bands.html
@@ -76,8 +76,8 @@
 
 </div>
 
-<script src="/static/js/spotsbandsandmap.js?v=1789763826"></script>
-<script src="/static/js/bands.js?v=1789763826"></script>
+<script src="/static/js/spotsbandsandmap.js?v=1789800912"></script>
+<script src="/static/js/bands.js?v=1789800912"></script>
 <script>$(document).ready(function () {
     $("#nav-link-bands").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/base.html b/templates/base.html
index 456bb53..75a8643 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -1,6 +1,6 @@
 {% extends "skeleton.html" %}
 {% block head_extra %}
-<link rel="stylesheet" href="/static/css/style.css?v=1789763825" type="text/css">
+<link rel="stylesheet" href="/static/css/style.css?v=1789800912" type="text/css">
 <link href="/static/vendor/css/bootstrap-5.3.8.min.css" rel="stylesheet">
 <link href="/static/vendor/css/fontawesome-6.7.2.min.css" rel="stylesheet">
 <link href="/static/vendor/css/solid-6.7.2.min.css" rel="stylesheet">
@@ -16,10 +16,10 @@
     window.fetchEventSource = fetchEventSource;
 </script>
 
-<script src="/static/js/utils.js?v=1789763825"></script>
-<script src="/static/js/ui-ham.js?v=1789763825"></script>
-<script src="/static/js/geo.js?v=1789763825"></script>
-<script src="/static/js/common.js?v=1789763825"></script>
+<script src="/static/js/utils.js?v=1789800912"></script>
+<script src="/static/js/ui-ham.js?v=1789800912"></script>
+<script src="/static/js/geo.js?v=1789800912"></script>
+<script src="/static/js/common.js?v=1789800912"></script>
 {% end %}
 {% block body %}
 <div class="container">
diff --git a/templates/conditions.html b/templates/conditions.html
index 550704d..7f5c5c4 100644
--- a/templates/conditions.html
+++ b/templates/conditions.html
@@ -284,7 +284,7 @@
 </div>
 
 <script src="/static/vendor/js/chart-4.4.9.umd.min.js"></script>
-<script src="/static/js/conditions.js?v=1789763825"></script>
+<script src="/static/js/conditions.js?v=1789800912"></script>
 <script>$(document).ready(function () {
     $("#nav-link-conditions").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/map.html b/templates/map.html
index 622dd7b..286f01c 100644
--- a/templates/map.html
+++ b/templates/map.html
@@ -113,8 +113,8 @@
     const CARTODB_API_KEY = "{{ web_ui_options.get('cartodb_api_key', '') }}";
 </script>
 
-<script src="/static/js/spotsbandsandmap.js?v=1789763825"></script>
-<script src="/static/js/map.js?v=1789763825"></script>
+<script src="/static/js/spotsbandsandmap.js?v=1789800912"></script>
+<script src="/static/js/map.js?v=1789800912"></script>
 <script>$(document).ready(function () {
     $("#nav-link-map").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/spots.html b/templates/spots.html
index b0f6620..aff599b 100644
--- a/templates/spots.html
+++ b/templates/spots.html
@@ -125,8 +125,8 @@
 
 </div>
 
-<script src="/static/js/spotsbandsandmap.js?v=1789763825"></script>
-<script src="/static/js/spots.js?v=1789763825"></script>
+<script src="/static/js/spotsbandsandmap.js?v=1789800912"></script>
+<script src="/static/js/spots.js?v=1789800912"></script>
 <script>$(document).ready(function () {
     $("#nav-link-spots").addClass("active");
 }); <!-- highlight active page in nav --></script>
diff --git a/templates/status.html b/templates/status.html
index a3b190e..0513b7b 100644
--- a/templates/status.html
+++ b/templates/status.html
@@ -96,7 +96,7 @@
     </div>
 </div>
 
-<script src="/static/js/status.js?v=1789763826"></script>
+<script src="/static/js/status.js?v=1789800912"></script>
 <script>
     $(document).ready(function () {
         $("#nav-link-status").addClass("active");