Persistence Source Address Indefinite

Indefinite does just that never times out. Not something I would use as over time the session table could build up and cause issues for new connections or cause tcp resource issues on your LTM. If this is an HTTP app with browsers as clients why don't you switch the persistence type to cookie using a session cookie. That will be good as long as the clients browser session is open. Just create a new persistence profile called cookie-insert and apply that to the Virtual server.