[eluser]InsiteFX[/eluser]
If you do not want it to change then change your settings!
Code:
$config['sess_time_to_update'] = 63072000; // update in 2 years
$config['sess_expiration'] = 0; // is the same as above value!
But keep in mind this will not update the values in the database or cookie.
It will however update the session userdata.