phpredis reconnection failing test

gistfile1.php

<?php

// redis docker containers
$serversList = array(
    'redis1',
    'redis2',
    'redis3',
    'redis4',
    'redis5',
);

$ra = new RedisArray(
    $serversList,
    array(
        "connect_timeout" => 10,
        "retry_timeout" => 3000,
        "retry_interval" => 3000
    )
);
//$ra = new RedisArray($serversList);

$key   = 'key';
$value = 'value';

$i = 0;
while (true) {
    echo "\n\n### $i";
    for ($j = 0; $j < 5; $j++) {
        $_key = $key . $j;
        echo "\n" . $ra->_target($_key);
        echo " > set: $j";
        $ra->set($_key, $j);
        echo "\nget: " . $ra->get($_key);
    }
    sleep(1);
    echo "\nsleep\n";
    $i++;
}