未知node.js和websockets服务器停止.谁修改了我的代码

我已经写了我的应用程序，现在我已经激活了New Relic，它每30分钟ping我的应用程序，以保持我的服务器存活(heroku)。否则之前服务器只是空转，然后在第一个请求上花费大量时间重新启动。

我正在运行套接字。IO服务器和我现在面临的问题是，经过大量的时间，服务器运行，它被困在回答名称空间。应用程序没有给出任何致命错误，它继续运行，只是停止回答。它保持正常工作(仍然检测和记录新连接的客户端)，但只是不发送消息。

日志没有异常

你能帮我检查一下我的代码是否做错了什么，我不应该做的，可能会产生问题?(例如，监听器太多等)

我对我的代码做了一个小总结，所以可能会有一些愚蠢的语法错误，但流程应该是这样的。所有内容重复4，因为我有4个名称空间和4个不同的查询。

var app = require('express')();
var http = require('http').Server(app);
var cors = require('cors');
var io = require('socket.io')(http);
var PORT = process.env.PORT || 8080;
var sensorSocket = io.of('/namespace1'); //This gives back all the sensor at once with just now values.
var oldata = [];
var intervalRefresh=300;
app.use(cors());
var mysql = require('mysql');
var connectionsArray = [];
var connection = mysql.createConnection({
    host: 'xxx',
    user: 'xxx',
    password: 'xxx',
    database: 'xxx',
    port: xx,
    dateStrings: 'date'
})
//websockets creation/connection
app.get('/', function (req, res) {
    res.sendFile(__dirname + '/client.html');
});
http.listen(PORT, function () {
    console.log(''n'n'n'n listening on port: %s', PORT);
});
io.of('/namespace1').on('connection', function (socket) {
    newconnectionSensors = 1;
    console.log("Client id: %s connected on /sensors", socket.id);
    console.log(io.of('/sensors').sockets.length);
    socket.on('disconnect', function () {
        console.log("Just left the ship grrarr : %s", socket.id);
    });
});
io.of('/namespace2').on('connection', function (socket) {
    [..Similar to the previous one..]
});

io.of('/namespace3').on('connection', function (socket) {
    [..Similar to the previous one..]
});

io.of('/namespace4').on('connection', function (socket) {
    [..Similar to the previous one..]
});
//Above here I do the same request every 300ms to the db and if there is any change, sends it into the client.
var CheckDB = setInterval(function (sensorSocket) {
    if (io.of('/namespace1').sockets.length > 0) {
        var query = connection.query('Query...'),
        data = []; // this array will contain the result of our db query
        query
            .on('error', function (err) {
                // Handle error, and 'end' event will be emitted after this as well
                console.log(err);
            })
            .on('result', function (result) {
                data.push(result);
            })
            .on('end', function () {
                if ((JSON.stringify(oldata) != JSON.stringify(data)) || newconnection == 1) { //if new data is different than the old data, update the clients
                    io.of('/namespace1').emit('message', dataSensors, io.of('/namespace1').sockets.id);
                    newconnection = 0;
                    oldata = data.slice(0); //copy of data to oldata
                }
            });
    }
}, intervalRefresh);
var CheckDB2 = setInterval(function (sensorSocket) {
        [..Similar to the previous one..]
}, intervalRefresh);
var CheckDB3 = setInterval(function (sensorSocket) {
        [..Similar to the previous one..]
}, intervalRefresh);
var CheckDB4 = setInterval(function (sensorSocket) {
        [..Similar to the previous one..]
}, intervalRefresh);