[split] ajax killing sessions?

To use the code the other user posted put the MY_Session.php file here: /application/libraries/Session/MY_Session.php and remove 'my_session' from autoload. It's an overload not a new library. That code stops AJAX requests from updating the session so if you are building a single page app all of your requests will start failing after your session expiration time has elapsed.

The core part of our app is a single page app and we have no such issues. You shouldn't need to overload the session library in that manner. Are users idling on a single page app then being logged out due to inactivity? Run a ping on a timer to keep the session alive.