wp_query orderby rand not working

I want to get 3 random posts from my custom post type posts.

My post type name = ‘portfolio’

The code display last posts but not in random order, always the 3 last pages :/ What I have to do :/

I have this code:

<?php
	remove_all_filters('posts_orderby');

	$argss=array(
		'post_type'=>'portfolio',
		'orderby'=>'rand',
		'posts_per_page'=>'3',
		'post__not_in'=>array($post->ID)
		);

	$queryObjects = new WP_Query($argss);
	// The Loop!
	if ($queryObjects->have_posts()) {
	   ?>
	   <aside class="random-pages-container clearfix">
	   <h2 class="random-header"><?php _e('Inne realizacje'); ?></h2>
	   <?php
	    while ($queryObjects->have_posts()) {
        $queryObjects->the_post();
        ?>

        <article class="random-page">
			<a href="<?php the_permalink();?>" title="<?php the_title();?>">
			<?php
			if ( has_post_thumbnail() ) {
				the_post_thumbnail();
			}
			else {
				echo '<img src="' . get_bloginfo( 'template_directory' ) . '/images/empty-th.jpg" alt="<?php the_title();?>" width="235"/>';
			}
			?>

			<h3 class="random-title"><?php the_title();?></h3>
			</a>
		</article>
   	 <?php
		} //endwhile
		?>
	</aside>
	<?php
	} //endif
	wp_reset_postdata();

	?>

I have also tried query_posts($args) but dont work.