title: GAE channels doesn't work after a while
body: <p>I use channel API in my Java GAE application. It works perfectly fine after I deploy app. I can connect to server and get messages from it in real time. I can even reconnect to new channels when old one expires. </p>
  
  <p>However if I keep my app open for few hours, this user cannot connect to server anymore. I'm getting 404 <code>/_ah/channel/dev?command=connect&amp;channel=XXX</code> new Channel opening. </p>
  
  <p>Instance shutdown via admin page doesn't help, however redeploying same code fix issue for another few hours. </p>
  
  <p>Is there are any other solution rather that redeploying app every few hours?</p>