diff --git a/apps/web/src/environments/runtime/service.threadSubscriptions.test.ts b/apps/web/src/environments/runtime/service.threadSubscriptions.test.ts
index 82964447d7a..087200451f3 100644
--- a/apps/web/src/environments/runtime/service.threadSubscriptions.test.ts
+++ b/apps/web/src/environments/runtime/service.threadSubscriptions.test.ts
@@ -176,6 +176,7 @@ describe("retainThreadDetailSubscription", () => {
           },
         })),
       },
+      isHeartbeatFresh: vi.fn(() => true),
       orchestration: {
         subscribeThread: mockSubscribeThread,
       },
@@ -382,7 +383,7 @@ describe("retainThreadDetailSubscription", () => {
     await resetEnvironmentServiceForTests();
   });
 
-  it("reconnects environment streams when the browser resumes from the background", async () => {
+  it("keeps healthy environment streams connected when the browser resumes from the background", async () => {
     let visibilityState: DocumentVisibilityState = "visible";
     const documentTarget = new EventTarget();
     const windowTarget = new EventTarget();
@@ -408,6 +409,57 @@ describe("retainThreadDetailSubscription", () => {
     documentTarget.dispatchEvent(new Event("visibilitychange"));
     expect(mockConnectionReconnects[0]).not.toHaveBeenCalled();
 
+    visibilityState = "visible";
+    documentTarget.dispatchEvent(new Event("visibilitychange"));
+    expect(mockConnectionReconnects[0]).not.toHaveBeenCalled();
+
+    stop();
+    await resetEnvironmentServiceForTests();
+  });
+
+  it("reconnects stale environment streams when the browser resumes from the background", async () => {
+    let visibilityState: DocumentVisibilityState = "visible";
+    const documentTarget = new EventTarget();
+    const windowTarget = new EventTarget();
+    vi.stubGlobal("document", {
+      addEventListener: documentTarget.addEventListener.bind(documentTarget),
+      removeEventListener: documentTarget.removeEventListener.bind(documentTarget),
+      get visibilityState() {
+        return visibilityState;
+      },
+    });
+    vi.stubGlobal("window", {
+      addEventListener: windowTarget.addEventListener.bind(windowTarget),
+      removeEventListener: windowTarget.removeEventListener.bind(windowTarget),
+    });
+    mockCreateWsRpcClient.mockReturnValue({
+      server: {
+        getConfig: vi.fn(async () => ({
+          environment: {
+            environmentId: EnvironmentId.make("env-remote"),
+            label: "Remote env",
+            platform: { os: "darwin", arch: "arm64" },
+            serverVersion: "0.0.0-test",
+            capabilities: { repositoryIdentity: true },
+          },
+        })),
+      },
+      isHeartbeatFresh: vi.fn(() => false),
+      orchestration: {
+        subscribeThread: mockSubscribeThread,
+      },
+    });
+
+    const { resetEnvironmentServiceForTests, startEnvironmentConnectionService } =
+      await import("./service");
+
+    const stop = startEnvironmentConnectionService(new QueryClient());
+    expect(mockConnectionReconnects).toHaveLength(1);
+
+    visibilityState = "hidden";
+    documentTarget.dispatchEvent(new Event("visibilitychange"));
+    expect(mockConnectionReconnects[0]).not.toHaveBeenCalled();
+
     visibilityState = "visible";
     documentTarget.dispatchEvent(new Event("visibilitychange"));
     expect(mockConnectionReconnects[0]).toHaveBeenCalledTimes(1);
diff --git a/apps/web/src/environments/runtime/service.ts b/apps/web/src/environments/runtime/service.ts
index 60c05fc217c..21a4561beb4 100644
--- a/apps/web/src/environments/runtime/service.ts
+++ b/apps/web/src/environments/runtime/service.ts
@@ -1482,9 +1482,12 @@ function reconnectEnvironmentConnectionsAfterBrowserResume(reason: string): void
   if (now - lastBrowserResumeReconnectAt < BROWSER_RESUME_RECONNECT_COOLDOWN_MS) {
     return;
   }
-  lastBrowserResumeReconnectAt = now;
 
   for (const connection of environmentConnections.values()) {
+    if (connection.client.isHeartbeatFresh()) {
+      continue;
+    }
+    lastBrowserResumeReconnectAt = now;
     void connection.reconnect().catch((error) => {
       console.warn("Environment reconnect after browser resume failed", {
         environmentId: connection.environmentId,
diff --git a/apps/web/src/rpc/wsRpcClient.ts b/apps/web/src/rpc/wsRpcClient.ts
index 2f1ca624d98..7128c909ab7 100644
--- a/apps/web/src/rpc/wsRpcClient.ts
+++ b/apps/web/src/rpc/wsRpcClient.ts
@@ -56,6 +56,7 @@ interface GitRunStackedActionOptions {
 export interface WsRpcClient {
   readonly dispose: () => Promise<void>;
   readonly reconnect: () => Promise<void>;
+  readonly isHeartbeatFresh: () => boolean;
   readonly terminal: {
     readonly open: RpcUnaryMethod<typeof WS_METHODS.terminalOpen>;
     readonly write: RpcUnaryMethod<typeof WS_METHODS.terminalWrite>;
@@ -158,6 +159,7 @@ export function createWsRpcClient(transport: WsTransport): WsRpcClient {
       resetWsReconnectBackoff();
       await transport.reconnect();
     },
+    isHeartbeatFresh: () => transport.isHeartbeatFresh(),
     terminal: {
       open: (input) => transport.request((client) => client[WS_METHODS.terminalOpen](input)),
       write: (input) => transport.request((client) => client[WS_METHODS.terminalWrite](input)),