title: APNS Tokens - Do iOS Sandbox tokens expire?
body: <p>Just out of curiosity, do sandbox push notifications for iOS expire? The reason I am asking is, yesterday my push notifications were working perfectly for my device and since then I haven't changed the code. Today I wanted to push another notification to further test and all of a sudden, no notification was received. I had to reinstall the app and get another token for it to work. </p>
  
  <p>So, do sandbox tokens expire, or do I possibly have a more serious issue at hand when I go to live?</p>