Leaks and releasing YouTubeThumbnailLoaders

I have an activity fragment with a single YouTubeThumbnailView in it. The view is set from an async task:

public class MyFragment extends Fragment {

  private YouTubeThumbnailView mThumbnailView;

  public class FetchThumbnailTask extends AsyncTask<> implements YouTubeThumbnailView.OnInitializedListener {

    protected void onPostExecute(String videoId) {
        mThumbnailView.setTag(videoId);
        mThumbnailView.initialize(YOUTUBE_DATA_API_KEY, this);
    }

    @Override
    public void onInitializationSuccess(YouTubeThumbnailView view, YouTubeThumbnailLoader loader) {
        loader.setVideo((String) view.getTag());
    }
  }
}

This causes the following error when I launch (or sometimes only when hitting the back button from) a YouTubeStandalonePlayer for the video in the thumbnail (when the thumbnail is clicked):

E/ActivityThread: Activity com.example.app.MyActivity has leaked ServiceConnection com.google.android.youtube.player.internal.r$e@1cc07092 that was originally bound here
android.app.ServiceConnectionLeaked: Activity com.example.app.MyActivity has leaked ServiceConnection com.google.android.youtube.player.internal.r$e@1cc07092 that was originally bound here

I assumed this had to do with the warning found in the docs about releasing YouTubeThumbnailLoaders when done with them. As suggested in other StackOverflow questions, I tried saving the loader as mThumbnailLoader in MyFragment from onInitializationSuccess and releasing it in the click action:

@Override
public void onInitializationSuccess(YouTubeThumbnailView view, YouTubeThumbnailLoader loader) {
    loader.setVideo((String) view.getTag());
    mThumbnailLoader = loader;
}

@Override
public void onClick(View v) {
    if (mThumbnailLoader != null) {
        mThumbnailLoader.release();
    }

    Intent intent = YouTubeStandalonePlayer.createVideoIntent(getActivity(), YOUTUBE_DATA_API_KEY, (String) v.getTag());
    startActivity(intent);
}

How do I correctly release the loader to avoid this issue?