Fix Chatbot Interface Response Bug

My AI receptionist chatbot has abruptly gone silent on the user-facing chat window—no replies are returned even though the backend logs show it is still generating answers. Nothing in the codebase changed just before the failure, so I need a sharp set of eyes to trace the breakdown that’s blocking the interface from delivering responses.

You’ll start by reproducing the problem in the live user interaction layer, isolate the point where messages stall, and then patch whatever is preventing them from reaching the screen. The tech stack is a typical React front end talking to a Node/Express service over WebSocket, with Redis for session state; familiarity with similar real-time messaging flows will help you move quickly.

Please be ready to dig in immediately—each missed response costs us callers.

Acceptance on my side will be straightforward:
• Users see replies again within the chat widget under normal load.
• The fix is committed with clear comments and a brief summary of root cause and changes.
• I can replicate the repair in staging and production without new breakages.

If you can jump on a screenshare today and get this receptionist talking again, let’s move.