Why Error: Connection lost: The server closed the connection on NodeJS v4.2.1?

Question

Node.js

Good afternoon
I installed NodeJS v4.2.1 on CentOS release 6.7, connected the Socket.IO v1.3.7 framework for delivering data via a web socket to the browser and launched this whole economy using PM2, after which I ran into the following problem.
Periodically, NodeJS can not be reached.
Here's what's in the browser:

Here's what's on the server in the logs.
I can not understand what it could be connected with. Maybe some of you faced a similar problem?

[email protected] [/home/nodejsv4.2.1]# tail -f /root/.pm2/logs/node-app-error-0.log
   at doNTCallback2 (node.js:439:9)
   at process._tickDomainCallback (node.js:394:17)
Error: Connection lost: The server closed the connection.
   at Protocol.end (/home/nodejsv4.2.1/node_modules/mysql/lib/protocol/Protocol.js:103:13)
   at Socket.<anonymous> (/home/nodejsv4.2.1/node_modules/mysql/lib/Connection.js:102:28)
   at emitNone (events.js:72:20)
   at Socket.emit (events.js:166:7)
   at endReadableNT (_stream_readable.js:903:12)
   at doNTCallback2 (node.js:439:9)
   at process._tickDomainCallback (node.js:394:17)
Error: Connection lost: The server closed the connection.
   at Protocol.end (/home/nodejsv4.2.1/node_modules/mysql/lib/protocol/Protocol.js:103:13)
   at Socket.<anonymous> (/home/nodejsv4.2.1/node_modules/mysql/lib/Connection.js:102:28)
   at emitNone (events.js:72:20)
   at Socket.emit (events.js:166:7)
   at endReadableNT (_stream_readable.js:903:12)
   at doNTCallback2 (node.js:439:9)
   at process._tickDomainCallback (node.js:394:17)

I will now run NodeJS without PM2 and see how it works.
Interestingly, exactly the same configuration on Debian Jessie works without problems, but then it crashes.

Answer 1

Did you manage to solve the problem in a year? share)
a similar problem but without PM2
I start node through init.d on Centos 6.9 node 8.4.0 (the last one is not the current moment)