diff --git a/webui/src/lib/chat.svelte.js b/webui/src/lib/chat.svelte.js
index ab86d50..b01b927 100644
--- a/webui/src/lib/chat.svelte.js
+++ b/webui/src/lib/chat.svelte.js
@@ -11,22 +11,27 @@ class ChatClient {
   connect() {
     if (this.#socket) return;
     this.#stopped = false;
+    clearTimeout(this.#reconnectTimer);
     const scheme = location.protocol === "https:" ? "wss" : "ws";
     const ws = new WebSocket(`${scheme}://${location.host}/ws?client_id=${encodeURIComponent(clientId())}`);
     this.#socket = ws;
     ws.onopen = () => {
+      if (this.#socket !== ws) return;
       this.connected = true;
       this.#dispatch({ type: "_open" });
     };
     ws.onerror = () => ws.close();
     ws.onclose = () => {
+      if (this.#socket !== ws) return;
       this.connected = false;
       this.#socket = null;
       this.#dispatch({ type: "_close" });
       if (!this.#stopped) this.#reconnectTimer = setTimeout(() => this.connect(), 1800);
     };
     ws.onmessage = (event) => {
-      const frame = JSON.parse(event.data);
+      if (this.#socket !== ws) return;
+      let frame;
+      try { frame = JSON.parse(event.data); } catch { return; }
       if (frame.type === "turn_updated" && frame.snapshot) this.turn = frame.snapshot;
       this.#dispatch(frame);
     };
diff --git a/webui/src/lib/components/ActivitySpine.svelte b/webui/src/lib/components/ActivitySpine.svelte
index 2d90273..191f10b 100644
--- a/webui/src/lib/components/ActivitySpine.svelte
+++ b/webui/src/lib/components/ActivitySpine.svelte
@@ -2,12 +2,12 @@
   import { chat } from "../chat.svelte.js";
 
   let { version = "" } = $props();
-  let lastTokens = $state(null); // { at, completion }
+  let lastTokens = null; // { at, completion } — plain bookkeeping, NOT reactive
   let rate = $state(null);
 
   $effect(() => {
     const turn = chat.turn;
-    if (!turn || turn.status !== "running") { rate = null; return; }
+    if (!turn || turn.status !== "running") { rate = null; lastTokens = null; return; }
     const completion = turn.usage?.completion_tokens;
     const now = Date.now();
     if (completion != null && lastTokens && now > lastTokens.at) {