Add a random number for cache busting

functions.php

<?php //remove this line if adding to an existing php file.

add_filter( 'resume_manager_get_resumes', 'bk_random_query_wpjm', 10, 2);
function bk_random_query_wpjm( $query_args, $args ){
  if ( $query_args['orderby'] = 'rand' ) {
    $query_args['rand_arg'] = wp_rand();
  }
  return $query_args;
}

apply_filters( 'resume_manager_get_resumes', $query_args, $args );