In order to Laravel and Lumen work properly with RoadRunner you have to use this library. Without it Laravel not reseting some components and can end up with bugs.
composer req updg/roadrunner-laravel
<?php
require __DIR__ . "/vendor/autoload.php";
$bridge = new \updg\roadrunner\laravel\Bridge();
$bridge->start();
That's it! Now just run RoadRunner server.