Has an AI agent ever run away on you? Looping, retrying, or burning credits long after it should have stopped

I'm researching runaway agent behaviour and want to hear real stories. By runaway, I mean the agent keeps going when it shouldn't. For example: • it repeats the same fix over and over • agents keep handing a task back and forth • it retries forever on an error • a background or sub-agent keeps running after you think it's done • auto top-up quietly refills your credits several times overnight If this has happened to you, I'd love to know: 1. What kind of agent was it? A coding agent, support bot, voice agent, research agent, workflow automation, or something else? 2. Did you build it, or was it someone else's product? For example, your own agent on the OpenAI or Anthropic APIs, a framework like LangGraph or CrewAI, a coding tool like Claude Code, Codex, Cursor or Copilot, or a hosted builder like Replit, Lovable or Emergent. 3. Did it cost you anything you could measure? Dollars charged, credits burned, quota used up, hours lost. A rough number is fine. Did the vendor refund any of it? 4. What did you do about it afterwards? Spend caps, iteration limits, turning off auto top-up, alerts, babysitting runs, switching tools? 5. What would have made it better? Faster detection, a hard stop that actually works, clearer usage visibility, a refund process, something else? Short answers are welcome. "Claude Code, looped on a failing test, about $40, I turned off auto top-up" is exactly the kind of thing I'm after. I'm not selling anything in this thread. If people are interested, I'll post a summary of what I hear back here.