diff --git a/client/lib/state/nodes_provider.dart b/client/lib/state/nodes_provider.dart
index 6292b3a..41b9665 100644
--- a/client/lib/state/nodes_provider.dart
+++ b/client/lib/state/nodes_provider.dart
@@ -30,9 +30,12 @@ class NodesNotifier extends AsyncNotifier<List<Node>> {
 
   @override
   Future<List<Node>> build() async {
+    _disposed = false; // build 重跑表示 notifier 仍在用:必须复位,否则上一轮 onDispose 置的
+    // true 会让 setLivePing/_measure 永久静默(urltest 回写/延迟实测失效 → 延迟冻成 —)。
     ref.onDispose(() => _disposed = true);
-    final auth = ref.watch(authProvider);
-    if (!auth.isLoggedIn) return const [];
+    // 只关心「是否登录」:token 续期(accessToken 变)不应重建 nodesProvider、清空已测延迟。
+    final loggedIn = ref.watch(authProvider.select((s) => s.isLoggedIn));
+    if (!loggedIn) return const [];
     try {
       final list = await _fetchWithRefresh();
       _lastFetch = DateTime.now();