Your question is Finding Root Cause. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you had to dig deep to identify the root cause of a problem. Explain how you separated symptoms from underlying causes, what data or stakeholders you relied on, and how you decided where to focus your investigation. Please describe your specific role, the actions you took, the outcome, and what you learned. I am looking for a concrete example that demonstrates analytical judgment, ownership, and persistence rather than a general description of your troubleshooting process.