Bug fix

https://github.com/2dust/v2rayN/issues/8906

v2rayN/ServiceLib/ViewModels/MsgViewModel.cs

@@ -86,15 +86,25 @@ public class MsgViewModel : MyReactiveObject
             }
             catch (Exception ex)
             {
-                _queueMsg.Enqueue(ex.Message);
+                EnqueueWithLimit(ex.Message);
                 _lastMsgFilterNotAvailable = true;
             }
         }
 
-        _queueMsg.Enqueue(msg);
+        EnqueueWithLimit(msg);
         if (!msg.EndsWith(Environment.NewLine))
         {
-            _queueMsg.Enqueue(Environment.NewLine);
+            EnqueueWithLimit(Environment.NewLine);
+        }
+    }
+
+    private void EnqueueWithLimit(string item)
+    {
+        _queueMsg.Enqueue(item);
+
+        while (_queueMsg.Count > NumMaxMsg)
+        {
+            _queueMsg.TryDequeue(out _);
         }
     }