Windows 10 in VirtualBox won't power off

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1

Hello.
I have a Windows 10 in my VirtualBox. I have corresponding VirtualBox Guest Additions. Several month ago it just happened that I could not power off this virtual machine. VBox was 7.0.18. Today I updated to 7.1.4. Problem stays.
I can reboot machine however. But not power off.
I just wait long enough, close main window of VirtualBox and then kill remaining process.
Any ideas?

2

https://forums.virtualbox.org/viewtopic.php?p=550497&sid=f662b7688ff011be1d5ccfe042a8e91a#p550497
…and following comments in the linked VB thread.

3

Thanks for that link. I read it.
I tried to uncheck ‘Enable USB Controller’ but it didn’t work, so I chose USB 3.0 instead of USB 1.1 and am able to power off machine.
I am not sure if that is a solution, so I’ll leave it open.