Code Igniter 1.7.3 database back sessions expire randomly

[eluser]blasto333[/eluser]

Code:

$config['sess_cookie_name']        = 'ci_session';
$config['sess_expiration']        = 0;
$config['sess_encrypt_cookie']    = FALSE;
$config['sess_use_database']    = TRUE;
$config['sess_table_name']        = 'sessions';
$config['sess_match_ip']        = FALSE;
$config['sess_match_useragent']    = TRUE;
$config['sess_time_to_update']         = 300;

My sessions that are database backed sometimes randomly expire and I lose the data in the session. I am using Code Igniter 1.7.3