node.js - Socket IO times out after some time - socket.io

Question

I'm trying to build up a socket.io server for my own multiplayer game, but for some reason the server goes down after a certain amount of time and I don't know why. I have tried several ways to run the server (nodemon and forever, everything with or without screen). I don't think that this is an inactivity problem because I added a random stuff generator to simulate some activity on the server, yet the problem persists. My cpu load with the running server stays between 2-3 %. I'm running node 4.x and the current stable socket.io build (1.3.6).
And here is my code:
var shortId = require('shortid'),
io = require('socket.io')(process.env.PORT || 4567),
mysql = require('mysql'),
connection = mysql.createConnection({
host: 'localhost',
user: 'xxx',
password: 'xxx',
database: 'xxx'
});
var clients = [];
var clientLookup = {};
//Placed Components (builded stuff from players or enviroment)
var placed_components = 'Server1_PlacedC';
connection.connect(function (err) {
if (err) {
console.error('error connecting: ' + err.stack);
return;
}
});
setInterval(function () {
var random = Math.random();
//connection.query(
// 'INSERT INTO '+placed_components+' SET ?',
// {data:countdown},
// function(err,result){
// if (err) throw err;
// }
//);
console.log(random);
}, 100);
io.on('connection', function (socket) {
var currentClient;
console.log('connected', socket.id);
//////////////////////////////////////////////////////////////////////////////
socket.on('disconnect', function () {
console.log('player disconnected', currentClient.id);
socket.broadcast.emit('disconnected', currentClient)
var index = clientLookup[currentClient.id];
clients.splice(index, 1);
})
///////////////////////////////////////////////////////////////////////////// /
socket.on('register', function (data) {
currentClient = {
id: shortId.generate(),
health: 100,
isDead: false
};
console.log('registering', currentClient.id);
clients.push(currentClient);
clientLookup[currentClient.id] = currentClient;
socket.emit('registerSuccess', {id: currentClient.id});
socket.broadcast.emit('spawn', {id: currentClient.id});
console.log('connected players', clients.length);
clients.forEach(function (client) {
if (currentClient.id == client.id)
return;
socket.emit('spawn', {id: client.id});
console.log('sending spawn to new player for playerid', client.id);
})
});
socket.on('beep', function () { // Beep Request
socket.emit('boop');
console.log("received some beep!");
});
socket.on('move', function (data) {
data.id = currentClient.id;
socket.broadcast.emit('move', data);
//console.log(JSON.stringify(data));
});
socket.on('ShareObject', function (data) {
data.id = currentClient.id;
socket.broadcast.emit('ReveiveObject', data);
console.log(JSON.stringify(data));
});
socket.on('SharePlayerAnimation', function (data) {
data.id = currentClient.id;
socket.broadcast.emit('BroadcastPlayerAnimation', data);
console.log("a Player changed his animation" + JSON.stringify(data));
});
//////////////////////////////////////////////////////////////////////////////
socket.on('benchmark', function (data) {
console.log(data);
});
//////////////////////////////////////////////////////////////////////////////
})
console.log('server started');