diff --git a/Emby.Dlna/PlayTo/PlayToController.cs b/Emby.Dlna/PlayTo/PlayToController.cs
index 67d5cfef42..c58f16438b 100644
--- a/Emby.Dlna/PlayTo/PlayToController.cs
+++ b/Emby.Dlna/PlayTo/PlayToController.cs
@@ -102,9 +102,10 @@ namespace Emby.Dlna.PlayTo
             {
                 _sessionManager.ReportSessionEnded(_session.Id);
             }
-            catch
+            catch (Exception ex)
             {
                 // Could throw if the session is already gone
+                _logger.LogError(ex, "Error reporting the end of session {Id}", _session.Id);
             }
         }
 
@@ -112,20 +113,14 @@ namespace Emby.Dlna.PlayTo
         {
             var info = e.Argument;
 
-            info.Headers.TryGetValue("NTS", out string nts);
-
-            if (!info.Headers.TryGetValue("USN", out string usn)) usn = string.Empty;
-
-            if (!info.Headers.TryGetValue("NT", out string nt)) nt = string.Empty;
-
-            if (usn.IndexOf(_device.Properties.UUID, StringComparison.OrdinalIgnoreCase) != -1 &&
-                !_disposed)
+            if (!_disposed
+                && info.Headers.TryGetValue("USN", out string usn)
+                && usn.IndexOf(_device.Properties.UUID, StringComparison.OrdinalIgnoreCase) != -1
+                && (usn.IndexOf("MediaRenderer:", StringComparison.OrdinalIgnoreCase) != -1
+                    || (info.Headers.TryGetValue("NT", out string nt)
+                        && nt.IndexOf("MediaRenderer:", StringComparison.OrdinalIgnoreCase) != -1)))
             {
-                if (usn.IndexOf("MediaRenderer:", StringComparison.OrdinalIgnoreCase) != -1 ||
-                    nt.IndexOf("MediaRenderer:", StringComparison.OrdinalIgnoreCase) != -1)
-                {
-                    OnDeviceUnavailable();
-                }
+                OnDeviceUnavailable();
             }
         }
 
@@ -612,22 +607,34 @@ namespace Emby.Dlna.PlayTo
 
         public void Dispose()
         {
-            if (!_disposed)
-            {
-                _disposed = true;
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
 
-                _device.PlaybackStart -= _device_PlaybackStart;
-                _device.PlaybackProgress -= _device_PlaybackProgress;
-                _device.PlaybackStopped -= _device_PlaybackStopped;
-                _device.MediaChanged -= _device_MediaChanged;
-                //_deviceDiscovery.DeviceLeft -= _deviceDiscovery_DeviceLeft;
-                _device.OnDeviceUnavailable = null;
+        protected virtual void Dispose(bool disposing)
+        {
+            if (_disposed)
+            {
+                return;
+            }
 
+            if (disposing)
+            {
                 _device.Dispose();
             }
+
+            _device.PlaybackStart -= _device_PlaybackStart;
+            _device.PlaybackProgress -= _device_PlaybackProgress;
+            _device.PlaybackStopped -= _device_PlaybackStopped;
+            _device.MediaChanged -= _device_MediaChanged;
+            _deviceDiscovery.DeviceLeft -= _deviceDiscovery_DeviceLeft;
+            _device.OnDeviceUnavailable = null;
+            _device = null;
+
+            _disposed = true;
         }
 
-        private readonly CultureInfo _usCulture = new CultureInfo("en-US");
+        private static readonly CultureInfo _usCulture = CultureInfo.ReadOnly(new CultureInfo("en-US"));
 
         private Task SendGeneralCommand(GeneralCommand command, CancellationToken cancellationToken)
         {