Random sorts reset every 24 hours to save server resources.

Try the following Code Snippet to refresh every hour or modify it as you like

function gd_snippet_rand_seed( $rand_seed ) {
	$minutes = 60; // SET MINUTES HERE

	$transient_name = 'geodir_rand_seed_custom_' . $minutes;
	$rand_seed = get_transient( $transient_name );

	// If we don't have a transient then set a new one
	if ( ! $rand_seed ) {
		$rand_seed = time();
		set_transient( $transient_name , $rand_seed, (int) $minutes * MINUTE_IN_SECONDS ); /* Updated after every x minutes */
	}

	// validate
	$rand_seed = absint( $rand_seed );

	return $rand_seed;
}
add_filter( 'geodir_rand_seed', 'gd_snippet_rand_seed' );