$.POST call php page over 2000 times

Question

I tried to call PHP page and it worked fine! PHP page is in a PHP session. I call the page about 2500 times.

But I have one problem: randomly the page generate a error:

session_start(): ps_files_cleanup_dir: opendir(C:\Windows\temp) failed: No error (0)

Javascript:

var vet = <?=json_encode($array)?>;
var ct = 0;

$(document).ready(function(){
   filter(vet[ct]);
});

function filter(report)
{
   $.post('handlers/export.php', {
      action: action,
      report: report
      }, function(updates) {
         values = JSON.parse(updateRecords);
         console.log(values);
      });
}

PHP

<?php
ini_set('default_socket_timeout', 3600); //60 minuti
ini_set("session.gc_maxlifetime", 3600); //60 minuti
set_time_limit (3600); //60 minuti

//VERIFICHE prima di caricare la pagina (richiesta)
if(session_status() != PHP_SESSION_ACTIVE)
   session_start();

...
?>

I have tried this solution: Issues with PHP 5.3 and sessions folder

The fix: In your php.ini set session.gc_probability to 0

but the problem perist