NodeJS TCP server random not responding - node.js

Question

I'm listening all the connections from a GPS device who is send the data to a our server. So I create a small NodeJs app to retrieve that information.
var net = require('net');
var server = net.createServer(function(connection) {
connection.on('drain', function(){
console.log('drain');
});
connection.on('data', function(data){
var dataGps = data.toString('ascii');
var fecha = new Date();
console.log(String(fecha));
var dataArray = dataGps.split(',');
});
connection.on('end', function() {
//console.log('Client disconnected'.magenta);
});
connection.on('error', function(err) {
//console.log("Connection error: " + err+" ... ".red);
//console.log('Closing connection....'.red);
//connection.destroy();
});
connection.on('close', function(){
console.log('closed event fired');
});
});
server.on('connection', function(){
console.log('new connection');
});
server.getConnections(function(err, count){
if (err) {
console.log('# Error: '+err);
}
console.log('Count: '+count);
});
server.listen(3001, function() {
console.log('Server is listening on port 3001...');
});
To keep running this App, I'm using pm2 (pm2 website).
Everything is fine except that sometimes this app becomes inactive and don't do anything until I restart it with pm2.
This app is in Amazon EC2 (t2.medium instance) Ubuntu 16.04.
I don't know what I'm doing wrong. Any help would be really helpful.