The following code will allow you to randomize the WooCommerce Related Products, if such functionality is desired:

/*
 * Randomize Related products
 */
add_filter( 'woocommerce_output_related_products_args', 'kallyasChild_randomizeRelatedProducts', 9000 );
function kallyasChild_randomizeRelatedProducts( $args ){
	if(! is_array($args)){
		// Set defaults if empty
		$args = array(
			'posts_per_page' => 4,
			'columns' 	 => 4,
		);
	}
	$args['orderby'] = 'rand';

	return $args;
}