Server 2019 Virtual Machine shuts down instead of reboot

Question

This VM is only a month old. It was a stock image - Server 2019 with SQL 2019. About 2 weeks ago, it did this same sort of thing, but I did not have time to track down Event Log entries at the time. This past weekend the VM was installing Windows Updates on Sunday morning. Everything installed fine and I got the following event entry:

Log Name: System

Source: User32

Date: 2/19/2023 2:35:27 AM

Event ID: 1074

Task Category: None

Level: Information

Keywords: Classic

User: SYSTEM

Computer: xxxxxxxxxxxxxx

Description:

The process C:\Program Files\Microsoft SQL Server IaaS Agent\Bin\SqlIaaSExtension.Service.exe (xxxxxxxxx) has initiated the restart of computer xxxxxxxxx on behalf of user NT AUTHORITY\SYSTEM for the following reason: Legacy API shutdown

Reason Code: 0x80070000

Shutdown Type: restart

Comment: Microsoft SQL Server Automated Patching needs to restart your machine

This seems normal. However, the VM never came back up until I initiated a restart from the Azure Portal on Monday morning. So, the server was down for all day Sunday. Any ideas as to why this happened? Why did it not restart cleanly?

Matt