异步redis组件，使用redis的订阅功能报错，求解！

借助redis的发布/订阅模式实现实时通信，由于进程订阅redis频道后会阻塞，必须使用异步redis组件。使用之后能够成功订阅频道，但是过一段时间redis链接就会断开。
代码如下：

    public static function onMessage($client_id, $message)
    {
        echo  '订阅前收到消息：', $client_id, PHP_EOL;
                self::$factory->createClient('redis://127.0.0.1:6379')->then(
            function (Client $client) use ($client_id) {
                $client->subscribe($client_id);
                $client->on('message', function ($channel, $message){
                    echo 'Message on ' . $channel . ': ' . $message . PHP_EOL;
                });
            },
            function ($exception) {
                echo $exception->getMessage();
            }
        );
        echo  '订阅后收到消息：', $client_id, PHP_EOL;
        self::$loop->run();
    }

    public static function onWorkerStart($worker)
    {
        self::$loop = Worker::getEventLoop();
        self::$factory = new Factory(self::$loop);
    }

错误信息如下：

process_timeout:
#1 /Volumes/Data/Code/WorkerFastCGI/vendor/react/event-loop/src/StreamSelectLoop.php(226): pcntl_signal_dispatch()
#2 /Volumes/Data/Code/WorkerFastCGI/vendor/react/event-loop/src/StreamSelectLoop.php(205): React\EventLoop\StreamSelectLoop->waitForStreamActivity(NULL)
#3 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/workerman/Events/React/Base.php(252): React\EventLoop\StreamSelectLoop->run()
#4 /Volumes/Data/Code/WorkerFastCGI/server/Events.php(55): Workerman\Events\React\Base->run()
#5 : Server\Events::onMessage('7f0000011b58000...', '{"msg_type":500...')
#6 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/gateway-worker/src/BusinessWorker.php(395): call_user_func('Server\\Events::...', '7f0000011b58000...', '{"msg_type":500...')
#7 : GatewayWorker\BusinessWorker->onGatewayMessage(Object(Workerman\Connection\AsyncTcpConnection), Array)
#8 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/workerman/Connection/TcpConnection.php(645): call_user_func(Array, Object(Workerman\Connection\AsyncTcpConnection), Array)
#9 : Workerman\Connection\TcpConnection->baseRead(Resource id #71)
#10 /Volumes/Data/Code/WorkerFastCGI/vendor/react/event-loop/src/StreamSelectLoop.php(238): call_user_func(Array, Resource id #71)
#11 /Volumes/Data/Code/WorkerFastCGI/vendor/react/event-loop/src/StreamSelectLoop.php(205): React\EventLoop\StreamSelectLoop->waitForStreamActivity(NULL)
#12 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/workerman/Events/React/Base.php(252): React\EventLoop\StreamSelectLoop->run()
#13 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/workerman/Events/React/Base.php(135): Workerman\Events\React\Base->run()
#14 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/workerman/Worker.php(2226): Workerman\Events\React\Base->loop()
#15 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/gateway-worker/src/BusinessWorker.php(197): Workerman\Worker->run()
#16 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/workerman/Worker.php(1352): GatewayWorker\BusinessWorker->run()
#17 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/workerman/Worker.php(1184): Workerman\Worker::forkOneWorkerForLinux(Object(GatewayWorker\BusinessWorker))
#18 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/workerman/Worker.php(1158): Workerman\Worker::forkWorkersForLinux()
#19 /Volumes/Data/Code/WorkerFastCGI/vendor/workerman/workerman/Worker.php(478): Workerman\Worker::forkWorkers()
#20 /Volumes/Data/Code/WorkerFastCGI/server.php(37): Workerman\Worker::runAll()
#21 {main}