Why does it say my session has expired?
If your Internet connection is unstable, periodically disconnecting and reconnecting, it can cause a website session to expire. When the Internet connection is lost the website connection can be terminated, resulting in a session expired message if you try to access any page after the Internet reconnects.
What is session expiration?
Session expiration is comprised of two timeout types: inactivity and absolute. An absolute timeout is defined by the total amount of time a session can be valid without re-authentication and an inactivity timeout is the amount of idle time allowed before the session is invalidated.