Why might a timeout occur? Suggest options based on the scheme (Frontend → Load Balancer → Service → Database).

A timeout can occur at any stage of the chain: Frontend → Load Balancer → Service → Database. Possible reasons:

• Frontend: slow connection, too short timeout on the client.
• Load Balancer: overload, incorrect timeout configuration, routing issues.
• Service: high load, locks, long operations, inefficient database queries.
• Database: slow queries, locks, network or resource issues.

For example, if the service takes a long time to process a request due to a complex database query, the load balancer may terminate the connection due to a timeout.