codex 0.39.0 stops early without finishing tasks

What version of Codex is running?

_No response_

Which model were you using?

_No response_

What platform is your computer?

_No response_

What steps can reproduce the bug?

use 0.39.0
submit a multistep task, or difficult task
Codex stop after a short period, say it’s doing same job while nothing is actually done

Switch back to 0.38.0 largely fix this problem

What is the expected behavior?

_No response_

What do you see instead?

_No response_

Additional information

_No response_