primary it should work with help of php function shuffle.
but you need to rebuild your code and replace the while loop with a foreach loop to use it.
here is a simple code how to use randomize(shuffle):
<?php
$rows = get_field('repeater_field_name' ); //get all rows
shuffle ($rows); //randomize rows
if($rows) {
foreach($rows as $row) { //print rows
echo $row['sub_field_name'];
echo ' ';
echo $row['sub_field2_name'];
echo '<br>';
}
}
?>
