How to prevent Windows Auto-update from force rebooting

Windows 10 has been force rebooting on me for the last two days -- resulting in loss of work and disruption of work. Needless to say, arbitrary force reboot is exacerbating and harmful.

What settings can I adjust in order to ensure that Windows 10 will not ever force reboot?

I have Windows 10 Education Version 1909.

Before the first of the 2 recent force reboot, there had not been any force reboot for several months. (Yes, it started off with way more and way worse.) The registry setting at the time in

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU

was

AUOptions = 5
NoAutoRebootWithLoggedOnUsers = 1
NoAutoUpdate = 0
ScheduledInstallDay = 1
ScheduledInstallTime = 4

The first force reboot had the description below. (Event ID 1074.)

The process C:\Windows\System32\usocoreworker.exe (DESKTOP-U7DHLNI) has initiated the restart of computer DESKTOP-U7DHLNI on behalf of user NT AUTHORITY\SYSTEM for the following reason: Operating System: Service pack (Planned)
 Reason Code: 0x80020010
 Shut-down Type: restart
 Comment: 

It occurred at 6:02AM.

When I discovered the force reboot, I changed AUOptions to 4 because this page seems to suggest that the NoAutoRebootWithLoggedOnUsers setting can only work with AUOptions set to 4. By all means, force reboot of any kind is annoying. I can manage my own security risk. But if reboot only occurs without any user logged in, it wouldn't cause loss of work in my setting.

Yet again, today at 4:25AM, my computer was forced reboot again. (It seems the reboot did not come from a user-scheduled policy?) Event Description below. (Event ID 1074.)

The process C:\Windows\servicing\TrustedInstaller.exe (DESKTOP-U7DHLNI) has initiated the restart of computer DESKTOP-U7DHLNI on behalf of user NT AUTHORITY\SYSTEM for the following reason: Operating System: Upgrade (Planned)
 Reason Code: 0x80020003
 Shut-down Type: restart

I happened to be physically using my computer at the time. The shutdown occurred almost immediately at that timestamp. 3 minutes before though, there was the following event: (Event ID 1074.)

The process C:\Windows\System32\usocoreworker.exe (DESKTOP-U7DHLNI) has initiated the restart of computer DESKTOP-U7DHLNI on behalf of user NT AUTHORITY\SYSTEM for the following reason: Operating System: Service pack (Planned)
 Reason Code: 0x80020010
 Shut-down Type: restart
 Comment: 

How do I prevent Windows 10 from force rebooting my computer?