Android : Facebook android: Request does not always hold

I want to send post on wall in facebook. So, I login with my own button:

LoginManager.getInstance().logInWithPublishPermissions(MainActivity.this, Arrays.asList("publish_actions"));

And then send post using Graph API:

 Bundle params = new Bundle();
 params.putString("message", "This is a test message");
 new GraphRequest(AccessToken.getCurrentAccessToken(),
                  "/me/feed",
                  params,
                  HttpMethod.POST,
                  new GraphRequest.Callback() {
                       @Override
                       public void onCompleted(GraphResponse graphResponse){
                       }
 }).executeAsync();

Code is working but not always. I press button, message send, again click on the button - the message is not sent. After some time the button is pressed again - sent.

Also if I use this code:

ShareLinkContent content = new ShareLinkContent.Builder()
                .setContentTitle("Title")
                .setContentDescription("Description")
              .setContentUrl(Uri.parse("http://developers.facebook.com/android"))
                            .build();
ShareApi.share(content, null);

It works good. What is problem? What is the error?