diff --git a/frontend/services/realtime.ts b/frontend/services/realtime.ts
index cdee028..e8db0b1 100644
--- a/frontend/services/realtime.ts
+++ b/frontend/services/realtime.ts
@@ -44,11 +44,30 @@ function connect() {
   sock.onerror = () => { try { sock.close(); } catch { /* ignore */ } };
 }
 
+// Fecha um socket que NÓS abrimos. Se ainda está em CONNECTING, chamar close()
+// agora dispara "WebSocket is closed before the connection is established"
+// (comum no double-mount do React StrictMode em DEV) → adiamos o close para o
+// onopen. Em todos os casos neutralizamos os handlers para o socket morto não
+// disparar reconexão (a reconexão automática por queda inesperada continua no
+// onclose original definido em connect()).
+function closeSocket(sock: WebSocket | null) {
+  if (!sock) return;
+  sock.onmessage = null;
+  sock.onerror = null;
+  sock.onclose = null;
+  if (sock.readyState === WebSocket.CONNECTING) {
+    sock.onopen = () => { try { sock.close(); } catch { /* ignore */ } };
+  } else {
+    sock.onopen = null;
+    try { sock.close(); } catch { /* ignore */ }
+  }
+}
+
 function ensureConnected() {
   const url = buildUrl();
   if (!url) return;
   // Clínica/token mudou → reconecta no canal certo.
-  if (ws && url !== currentUrl) { try { ws.close(); } catch { /* ignore */ } ws = null; }
+  if (ws && url !== currentUrl) { closeSocket(ws); ws = null; }
   if (!ws || ws.readyState === WebSocket.CLOSING || ws.readyState === WebSocket.CLOSED) connect();
 }
 
@@ -61,13 +80,13 @@ export const Realtime = {
       handlers.delete(handler);
       if (handlers.size === 0) {
         if (reconnectTimer) { clearTimeout(reconnectTimer); reconnectTimer = null; }
-        if (ws) { try { ws.close(); } catch { /* ignore */ } ws = null; }
+        if (ws) { closeSocket(ws); ws = null; }
       }
     };
   },
   /** Força reconexão (ex.: ao trocar de workspace). */
   reconnect() {
-    if (ws) { try { ws.close(); } catch { /* ignore */ } ws = null; }
+    if (ws) { closeSocket(ws); ws = null; }
     backoff = 1000;
     ensureConnected();
   },