title: sounds not playing with mediaplayer after playing some sounds
body: <p>I'm developing an android application which is collection of 100 sound effects.
  After I play for instance 25 of the sounds, I can't play anymore and I have to close the application and wait for some minutes then open the application and now I can play other sounds.</p>
  
  <pre><code>final MediaPlayer mp81 = MediaPlayer.create(MainActivity.this, R.raw.a81);
  </code></pre>
  
  <p>I play the sound using the below code:</p>
  
  <pre><code>mp81.start();
  </code></pre>
  
  <p>I stop the playing sound using the below code:</p>
  
  <pre><code>mp81.seekTo(0);
  </code></pre>
  
  <p>I also used <code>stop()</code> method but the problem were still existing.
  is there any other method i have to add?</p>