title: Google App Engine instances stop responding
body: <p>This started happening about 2 weeks ago. I have 2 websites hosted on App Engine. All of a sudden both started showing blank screens on every request. Both had instances running and there were no errors in the logs.</p>
  
  <p>After some trial an error I found that running the deployment (appcfg update) fixes this problem, but only for an hour or so. My colleague also found out that shutting down running instances also gets rid of the blank screen and also for a limited time.</p>
  
  <p>The period during which site remains functional varies from 10 mins to 2 hours. The the blank screen. The logs either show no errors or keep loading forever showing nothing at all.</p>
  
  <p>At the moment I have 2 tasks in scheduled to run every 10 minutes that start deployment scripts for every site. Again, this started happening on 2 sites at the same time and both sites haven't been updated in a while, nor have I changed any app engine related settings for them.</p>