Codex credits are draining while idle / not actively used

The CODEX app consumed 1500 credits from my account while I was sleeping. When I sat down at my PC, I saw it charging 300 credits in increments of 100, even though I hadn’t used anything. I disabled automatic billing and checked, and it had stopped charging in increments of 100 and started consuming credits in increments of 10, even though I hadn’t used any prompts. I was researching this, and it seems several other people had the same problem. When my account ran out of credits, it charged my credit card until I disabled automatic billing.