Codex credits are draining while idle / not actively used

I encountered the same issue yesterday. I originally had around 60 hourly credits remaining, but they were all used up in about half an hour, even though I barely did any work during that time. After the hourly credits refreshed five hours later, I opened Codex and noticed the hourly credits dropping by 1% visibly by the second. I thought my account had been compromised, so I went to the security settings on the GPT website and logged out all active sessions. After that, the credits stopped draining continuously. However, as soon as I opened Codex this morning, the credits started depleting automatically again. I have since enabled two-factor authentication, and I’m absolutely certain there are no security issues with my account.