title: paypal subscriptions and unexpected sandbox events
body: <p>We have implemented paypal subscriptions and have been testing them in the sandbox for about 2 months. In out IPN transactions, there are several events that we see that are unexpected: </p>
  
  <ul>
  <li>the occasional '<code>subscr_failed</code>' </li>
  <li>the even worse '<code>recurring_payment_suspended_due_to_max_failed_payment</code>'</li>
  </ul>
  
  <p>Some of our test sessions were for subscriptions recurring daily, some weekly, and some monthly. </p>
  
  <p>Neither of the two events above were caused by us in the sandbox account. 
  Can anyone tell me where these come from, any why they occur in the sandbox? I am afraid to go live if the behaviour can have randon events like this.</p>