Linux box becomes unresponsive over network when local user logs out [closed]

So, my dad insists on hosting his own website from his own home computer. I set this up on a Linux Mint box, using a very simple server written in Go and this worked fine for years. Recently the setup has developed the fault that when he logs out of his local session on the machine (some GUI desktop environment like Gnome, whatever linux mint comes with) then the web server stops responding to external requests. The SSH daemon is also unresponsive externally.

The only thing I can think of is maybe the machine goes into some kind of power saving mode because it thinks its not needed due to having no local user.

Any ideas how to investigate or fix this?

Thanks!

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Author: felix