title: Windows Phone 8.1 VibrationDevice doesn't stop vbration
body: <p>I found a following issue of vibration device on Windows Phone 8.1 XAML application.</p>
  
  <p>The code</p>
  
  <pre><code>var vibrationDevice = VibrationDevice.GetDefault();
  vibrationDevice.Vibrate(TimeSpan.FromMilliseconds(50));
  </code></pre>
  
  <p>The first time when it's called, the vibration starts and doesn't stop until the next call. The following calls works correct - phone vibrates for short time and stops.</p>
  
  <p>It reproduces on Lumia 920 at 100% calls and at Lumia 930 at 1% of calls.
  It reproduces on WP 8.0 and WP 8.1</p>