If you have automatic updates enabled, this will happen. Also, if you have Windows Update set to download and prompt you when it’s ready to install the update packages, and you accidentally clicked on a confirmation that you wanted to install.
Are you telling me MS is not smart enough to give you the option to postpone or save your work before restarting your computer against your will? I was not given the option. There was no “OK” button to click on. It just did it.
I’ve seen computers do this hundreds of times but always there was a warning or an opt out offered, and “click ok to procede”. This time there was nothing.