Virtual Machine went down at 1AM UTC and never back up

Hi,

I have a production Virtual Machine, which went down today at 1am UTC to 7am UTC.

As soon as I logged in the Control Panel, I found the VM to be "Stopped" and I started it manually.

1. Why was my VM turned off?
2. Why did it not go up again?
3. Where can I view the logs of what happened to my VM? The states it switched, at what time, and why?
4. How can I make sure this never happens again?