Giving up - Win10 [Home version anyway] is not up to the job.
I have stopped/disabled every service I could think of but it still logged out and re-booted at 6am today, in the event logs it had 185...

Agreed - anyway can't take separate the one machine as it is connected via an 8-port switch which then has the link to the router and internet. I do an incremental backup daily - in case the wife...

On my home network I have a 'basic' machine running Novosoft HandyBackUp.
This is left unattended with HandyBackUp, Windows Explorer & Task Manager windows open.
The backup program runs at 3am each...