title: Sprite Kit & playing sound leads to app termination
body: <h3>using ARC</h3>
  <p>Just a problem I've run into-
  I have an SKScene in which I play a sound fx using SKAction class method</p>
  <pre><code>[SKAction playSoundFileNamed:@&quot;sound.wav&quot; waitForCompletion:NO];
  </code></pre>
  <p>Now when I try to go to background, no matter that the sound was over, apparently iOS is terminating my app due to <code>gpus_ReturnNotPermittedKillClient</code>.</p>
  <p>Now only when I comment this line and not running the action iOS runs it great in background (of course, paused, but without termination).</p>
  <p>What am I doing wrong?</p>
  <p><strong>EDIT</strong>: iOS will not terminate the app if the line wasn't run- say, if it was in an <code>if statement</code> that wasn't run <code>(soundOn == YES)</code> or something like that, when the bool is <code>false</code></p>