[BUG] Frequent mid-session 401 errors

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

After recent update (within last week), getting frequent mid-session 401 errors in Claude Code in the desktop app (Windows 11).

Failed to authenticate. API Error: 401 {"type":"error","error":{"type":"authentication_error","message":"Invalid authentication credentials"},"request_id":"req_011Ca7eMZaEWxrcefZLfmC8e"}

I have to close out of the app and restart it, which is disruptive to work flow. Prior to this I could remain logged in and active for days.

What Should Happen?

Claude Code should not log me out mid-session.

Error Messages/Logs

Steps to Reproduce

Use Claude Code in desktop (Windows 11), be inactive for any short period of time (30 minutes?) and come back to make a subsequent request.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.2773.0 (884b37)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_