Comment 1 for bug 1939425

The power option simply calls GNOME Session Shutdown

https://github.com/solus-project/budgie-desktop/blob/master/src/applets/user-indicator/UserIndicatorWindow.vala#L342

Since this works for most people - the issue must be more underlying - so whatever GNOME Session calls - probably SystemD or the linux kernel.

As such please report the problem in the first instance against the kernel - please note the above in your query.

Run in a terminal:

    ubuntu-bug linux

This will report properly with details of your system.