My Son-in-law works for Google. I called his yesterday to get his take on this. He said no one around work had been talking about it. He also told me how to fix it. (I don't know how well it fixes it because I just made the changes) but.
Go to the Window icon on the bottom left, metro I suppose.
On the bottom left just above Power is Settings, go to Settings.
At the upper right of the settings page is a search box.
Type in: windows update.
Choose: advanced windows update options
Choose Notify to reschedule start.
You can also choose to get or not get other MS products when you update windows.
You can see all the installed updates and have an option to uninstall any of them under: View your update history.
So, if you choose to be notified of the time, I suppose you can stop it, IDK... but at least you will have more control and can uninstall, backup, and restore from there. I also chose to not let updates be network wide from one computer to another on the network... I never heard of that!
More:
http://www.pcworld.com/article/2953010/windows/how-to-schedule-your-windows-10-updates.html I also read somewhere how to hack the registry to add a manual update option but I'm not sure I want to do that.
Maybe this will help.
J