This is extremely frustrating. I'm on win 10 pro and have the "notify to schedule restart" option checked in windows update. Yet, today and in the past after I start updates and leave my computer for a bit, I will sometimes find it magically restarted when I come back. No warning or anything. This time I happen to be uploading a very large file to the internet which I now have to restart.

Anybody else eperiencing this. Any way to fix?