iOS Notifications push server with php - php

Question

I have something wrong with my notifications but i can't see where is the problem. I have an app that generates the token successfully, at first I was able to send a notification from my localhost to the device, but after i restored the device and and tested with the new device token to push a simple notification i couldn't get get it to work even though I didn't made any changes to php code nor my app code, here is my php code :
require_once 'ApnsPHP/Autoload.php';
// Instantiate a new ApnsPHP_Push object
$push = new ApnsPHP_Push(
ApnsPHP_Abstract::ENVIRONMENT_SANDBOX,
'server_certificates_bundle_sandbox.pem'
);
// Set the Root Certificate Autority to verify the Apple remote peer
$push->setRootCertificationAuthority('entrust_root_certification_authority.pem');
// Connect to the Apple Push Notification Service
$push->connect();
// Instantiate a new Message with a single recipient
$message = new ApnsPHP_Message($token);
// Set a simple welcome text
$message->setText("GELLLOOOOOO");
// Play the default sound
$message->setSound();
// Add the message to the message queue
$push->add($message);
$push->send();
$push->disconnect();
// Examine the error message container
$aErrorQueue = $push->getErrors();
var_dump($aErrorQueue);
I think it have something to do with certificates but i'm not sure where is the issues since it was working before and there is nothing in $aErrorQueue , just an empty array.