Maybe this in configuration.nix:

#sleep when press power button
services.logind.extraConfig = ''
HandlePowerKey = suspend
IdleAction = suspend
IdleActionSec =1m
'';
#screen locker
programs.xss-lock.enable = true;

I’m using a stable channel (23.05). After automatic update kernel version is 6.1.62

I would start with a virtual machine. Then, when the system is debugged, you can copy the configuration files somewhere (GitHub or other storage) and then reproduce the configuration on bare metal.

that knock out the internet for months.

This could have ended the discussion.