title: if admob ads dont show game freezes in unity android app
body: <p>I have this Unity game for android and i'm trying to use the <code>admob plugin</code>. 
  I request a banner 5 seconds after starting game and every 45 seconds after that. Sometimes banner doesn't show up i have no idea why. The real problem is if banner doesn't show and i try to quit the game by calling:</p>
  
  <pre><code>Application.Quit()
  </code></pre>
  
  <p>or</p>
  
  <pre><code>System.Diagnostics.Process.GetCurrentProcess().Kill();
  </code></pre>
  
  <p>it freezes and doesn't quit so i quit with home button. Next time i try to run the game it doesn't start if i don't force close it before running. Any ideas why i can't quit properly or the banner not showing?</p>
  
  <p>EDIT: I've put the game on play store and asked a friend to test it. Ads show every time he runs the game</p>