[BUG] Claude Code maxes out CPU usage even when idle

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?

Sometimes after leaving my Claude instances idle for a while, they start spinning and consuming an entire CPU apiece.

What Should Happen?

Claude should use a respectable amount of CPU.

Error Messages/Logs

Couldn't find any

Steps to Reproduce

1. Run claude
2. Go do something else
3. CPU 100%

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.160

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_