Logout problem

Hello Developers ,

We have problem with our website  , users are logged out randomly ! these are the cookies configs , Please help

PHP Code:

$config['encryption_key'] = 'swexds'; // front end

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session_front';
$config['sess_expiration'] = 60*60*24*365; // full year
$config['sess_save_path'] = APPPATH ."storage/sessions";
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = TRUE;


$config['cookie_prefix']    = 'xrd_'; // front end
$config['cookie_domain']    = '';
$config['cookie_path']        = '/';
$config['cookie_secure']    = FALSE;
$config['cookie_httponly']     = TRUE; 


Can you please help us because this is urgent ?

have you tried changing the sess_cookie_name i encounter this once. when two ci session with the same sess_cookie_name the other one logout