diff --git a/UIShare/GlobalVariable/HardwareDataBroadcaster.cs b/UIShare/GlobalVariable/HardwareDataBroadcaster.cs
index a5e0fbf..2380403 100644
--- a/UIShare/GlobalVariable/HardwareDataBroadcaster.cs
+++ b/UIShare/GlobalVariable/HardwareDataBroadcaster.cs
@@ -1,8 +1,10 @@
 using Common.Attributes;
 using DeviceCommand.Base;
+using Logger;
 using Model.Models;
 using Prism.Events;
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -41,6 +43,18 @@ namespace UIShare.GlobalVariable
         private CancellationTokenSource? _cts;
         private bool _disposed;
 
+        /// <summary>是否已完成过至少一次 Discover（幂等标记，避免多作用域重复调用时 Clear + 重扫）</summary>
+        private bool _discovered;
+
+        /// <summary>连续失败次数达到此阈值后，暂停该通道采样并发布报警</summary>
+        private const int FailureThreshold = 5;
+
+        /// <summary>每通道连续失败计数（key = fingerprint + "|" + methodName）</summary>
+        private readonly ConcurrentDictionary<string, int> _failureCounts = new();
+
+        /// <summary>已因连续失败而被暂停的通道（key 同上）</summary>
+        private readonly ConcurrentDictionary<string, bool> _suspendedChannels = new();
+
         /// <summary>采样间隔（默认 1000ms）</summary>
         public TimeSpan SampleInterval
         {
@@ -89,9 +103,12 @@ namespace UIShare.GlobalVariable
         /// <summary>
         /// 扫描 GlobalInfo.HardwarePool 中所有已创建的物理设备，
         /// 反查可监测方法并编译为委托。每个指纹只注册一次，反射只执行一次。
+        /// <para>幂等：首次调用后再次调用不会 Clear 重扫，避免多作用域重复 Discover 导致短暂采样中断。</para>
         /// </summary>
         public void Discover()
         {
+            if (_discovered) return;
+            _discovered = true;
             _registeredMethods.Clear();
 
             foreach (var poolEntry in _globalInfo.HardwarePool)
@@ -157,6 +174,11 @@ namespace UIShare.GlobalVariable
 
             foreach (var entry in _registeredMethods)
             {
+                string channelKey = entry.Fingerprint + "|" + entry.MethodName;
+
+                // 已暂停的通道跳过采样
+                if (_suspendedChannels.ContainsKey(channelKey)) continue;
+
                 // fire-and-forget：每个通道独立采样，完成后自行广播
                 _ = Task.Run(async () =>
                 {
@@ -167,6 +189,9 @@ namespace UIShare.GlobalVariable
 
                         if (!double.TryParse(raw, out double value)) return;
 
+                        // 采样成功，重置失败计数
+                        _failureCounts.TryRemove(channelKey, out _);
+
                         // 向所有引用该物理设备的作用域分别广播
                         var scopes = GetScopesForFingerprint(entry.Fingerprint);
                         foreach (var scope in scopes)
@@ -188,9 +213,24 @@ namespace UIShare.GlobalVariable
                             }
                         }
                     }
-                    catch
+                    catch (Exception ex)
                     {
-                        // 单个通道故障不干扰其他通道
+                        int count = _failureCounts.AddOrUpdate(channelKey, 1, (_, c) => c + 1);
+                        LoggerHelper.Warn($"采样通道 [{entry.Fingerprint}/{entry.MethodName}] 第 {count} 次失败: {ex.Message}");
+
+                        if (count >= FailureThreshold)
+                        {
+                            _suspendedChannels.TryAdd(channelKey, true);
+                            LoggerHelper.Error($"采样通道 [{entry.Fingerprint}/{entry.MethodName}] 连续失败 {count} 次，已暂停采样");
+
+                            // 向所有引用该设备的作用域发布报警
+                            var scopes = GetScopesForFingerprint(entry.Fingerprint);
+                            foreach (var scope in scopes)
+                            {
+                                _eventAggregator.GetEvent<AlarmEvent>().Publish(
+                                    (scope, entry.Fingerprint, $"通道 {entry.MethodName} 连续失败 {count} 次，已暂停"));
+                            }
+                        }
                     }
                 }, token);
             }
@@ -209,6 +249,8 @@ namespace UIShare.GlobalVariable
             _cts?.Dispose();
             _cts = null;
             _registeredMethods.Clear();
+            _failureCounts.Clear();
+            _suspendedChannels.Clear();
         }
     }
 }