Default post type pagination page 2 404 error

Hi!

I have to change the default post type slug, because it is the child of an another Page. I used this in my functions.php:

add_action( 'init', 'my_new_default_post_type', 1 );
function my_new_default_post_type() {

    register_post_type( 'post', array(
        'labels' => array(
           'name_admin_bar' => _x( 'Post', 'add new on admin bar' ),
        ),
        'public'  => true,
	'show_in_menu' => false,
        '_builtin' => false,
        '_edit_link' => 'post.php?post=%d',
        'capability_type' => 'post',
        'map_meta_cap' => true,
        'hierarchical' => false,
        'rewrite' => array( 'slug' => 'aktualis/hirek-aktualis', 'with_front' => false ),
        'query_var' => false,
        'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'comments', 'revisions', 'post-formats' ),
    ) );
}

It worked, but when I get the posts with a query, my pagination does not work, it returns 404 page.

The Query:

$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$news = new WP_Query(array(
	'post_type' => 'post',
	'posts_per_page' => 3,
	'paged' => $paged
));
if($news->have_posts()) : while($news->have_posts()) : $news->the_post();
	//The content
endwhile;
wp_reset_postdata();
endif;

And the pagination:

$pagination = paginate_links(array(
	'total' => $news->max_num_pages,
	'current' => $paged,
	'show_all' => false,
	'type' => 'list',
	'base' => get_permalink(get_the_ID()).'%_%',
	'format' => 'page/%#%',
	'end-size' => 3,
	'mid-size' => 0,
	'prev_text' => 'prevlabel',
	'next_text' => 'nextlabel'
));

I tried everything that come to my mind to fix this. But still have no solution. Has everyone the same problem and the solution for this?