Why does socket io disconnect?

Question

Node.js

Hello, can anyone tell me what the problem is.
There is a website and a server application to it written in nodejs , information exchange between the website and the application occurs through socket io
The essence of the problem:
Every morning, at about 6:00 - 6:30, the connection between the site and the application is disconnected.
There are three copies of this site, they all work on different VPS from one hoster, but the problem is observed only on two sites.

Answer 1

Apparently there is a short-term reset of the VPS connection. I would do the processing and reconnection instead of looking for the perfect VPS.