title: iPhone: All animation stopped working after a while
body: <p>I've gotten some strange behavior lately. All animation suddenly stops working sometimes. 
  Sometimes everything runs smooth, and other times this happens. Pushing and popping views just snaps into place, <code>UITableView</code> cellrow animation doesn't work. </p>
  
  <p>The app uses a lot of background threads so maybe there is something in there? </p>
  
  <p>I can't really post code since I don't know where the problem is. </p>
  
  <p>Has anyone had the same problem?</p>