Managing Session

Hello Igniters,
I'm having issues with the session on my website. Below are the current config values for my session., but still my session expires even my browser wasn't closed.
public $sessionDriver = 'CodeIgniter\Session\Handlers\FileHandler';
public $sessionCookieName = 'ci_session';
public $sessionExpiration = 0;
public $sessionSavePath = WRITEPATH . 'session';
public $sessionMatchIP = false;
public $sessionTimeToUpdate = 0;
public $sessionRegenerateDestroy = false;


Hope you can give any solution to solve this issue.
Thank you!