Codex session repeatedly disconnects: websocket closed before response.completed

Summary

While running a Codex task, the connection became very unstable and repeatedly showed reconnecting behavior. The session eventually surfaced this error:

stream disconnected before completion: websocket closed by server before response.completed

The UI showed reconnect attempts such as Reconnecting... 2/5 during the task.

Feedback ID

019e62a9-9544-7780-864a-566226a188ac

Environment

• Codex app version: 26.519.41501 (3044)
• macOS: Tahoe 26.5
• Device: MacBook Pro 16-inch, Apple M5 Max, 128 GB memory
• Network: home network, no VPN enabled

Expected behavior

Codex should keep the session stream stable until the task completes, or recover cleanly after a transient reconnect without losing the response/completion state.

Actual behavior

The stream disconnected before completion and the websocket was closed by the server before response.completed, causing the task to become unstable instead of finishing normally.

<img width="2102" height="260" alt="Image" src="https://github.com/user-attachments/assets/9eb2fd65-100b-46fd-80cb-59e6af764612" />