Context restarts randomly.

What version of Codex is running?

codex-cli 0.39.0

Which model were you using?

gpt-5-codex-high

What platform is your computer?

Darwin 24.5.0 arm64 arm

What steps can reproduce the bug?

Asking Codex to summarize it's working session as a .md file

What is the expected behavior?

Creating the .md report with all the prior context

What do you see instead?

Created .md file does not reflect working session and context shows it reset and is back to 99%

Additional information

This has happened to me twice.