I am experiencing a critical issue in a Node.js application where users are being logged out after only 5 to 10 minutes of activity. This began right after migrating the session store from file-based storage to Redis. The environment variables look correct, but something is misconfigured in the Redis setup or the session middleware. This is frustrating customers and hurting retention. I need someone experienced with Node.js, Express sessions, and Redis to diagnose the root cause, implement a fix, and ensure sessions stay stable in production. Scope of Work Investigation and diagnosis Configuration fix across env variables, session middleware, Redis client config Redis optimization Multi-user testing and validation Summary and recommendations