Do a Root-Cause Analysis

    Help me find the root cause of a problem, not just its symptoms.

The problem (what's happening, and what I know about it — when it started, what changed, what I've observed):
{{problem}}

Please:
- Restate the problem and its visible **symptoms** clearly.
- Work backward with a **"5 Whys"-style** chain (or a small cause tree if there are several branches), each step asking why the previous one happens — based on what I told you.
- Identify the likely **root cause(s)**, and distinguish confirmed causes from hypotheses that still need checking.
- Suggest how to **verify** each suspected cause, and what would address the root rather than patching the symptom.

Don't jump to a cause the evidence doesn't support, and don't invent details about what happened — where you're hypothesizing, label it and say what would confirm or rule it out. If I haven't given you enough to trace it, tell me what information would help.