title: simplexml_load_file works fine at server 5 min, then suddenly stops
body: <p>I am running a code on website, it works like 5 min, then suddenly stopping. </p>
  
  <pre><code>$use_errors = libxml_use_internal_errors(true);
  $xml = simplexml_load_file($url);
  libxml_clear_errors();
  libxml_use_internal_errors($use_errors);
  echo $xml-&gt;ratio;
  </code></pre>
  
  <p>On my webserver the function allow_url_fopen is enable, php version is 5.5</p>