KACE Product Support Question
Force Reboot Really Force Rebooting!
Community Chosen Answer
Unexpected Shutdown simply means: It was not initiated by the user.
In the case of KACE it was initiated by the agent using the SYSTEM service.
The agent runs a "standard" shutdown /r, which safely ends all services and does a normal reboot.
Microsoft right now does not provide any other way to do this.
You can set a GPO to remove the message if the users don't understand the meaning of the popup.
The needed GPO is found under the Admin Templates: Display Shutdown Event Tracker