Jus in case it helps someone some day....
The issue was related to the daily updater that has now raspbian, I'm very surprised that nobody else has the issue, most probably you have not realized the restarts.
Solution is:
~$ sudo systemctl stop apt-daily.timer
~$ sudo systemctl disable apt-daily.timer
~$ sudo systemctl disable apt-daily.service
~$ sudo systemctl daemon-reload
Note the issue could be anytime in my case I have several times node-red but latest one network was down until power cycle, I guess will depends on what is updated at he moment of the action.
The hour is random as system add a random timer for next update sesion.
Regards
