title: iOS app no longer receiving push notifications
body: <p>We had push notifications all nicely set up for our iOS app, but they stopped working a few weeks ago.</p>
  
  <p>It looks like our requests are sent to <code>APNS</code> ok, but push notifications are not being received.</p>
  
  <p>The only thing that has changed is:<br></p>
  
  <ol>
  <li>Number of users in our database has grown to about <code>150</code><br></li>
  <li>The SSL certificate for our domain (not the <code>local_cert</code> that is sent to <code>APNS</code>) expired, but I don't think this would be the cause(?)<br></li>
  </ol>
  
  <p>It all worked fine before, and everyone is still using the same version of the app.</p>
  
  <p>Just wondering if anyone else has experienced this or may be able to offer a suggestion?</p>