Same thing happened to me. Luckily, I got the message that Windows couldn’t reboot until a program had finished, and that program was the Plex installer so it almost saved itself. Of course, it still closed all of my programs and such before I could hit “Cancel.” I agree that it seems to be the vc_redist64 installation (with “/install /quiet”) that is doing it, as I was also watching the detailed install.
Rebooted without prompting:
The process C:\Program Files\Plex\Plex\vc_redist.x64.exe (XPS_13) has initiated the restart of computer
Thank god I didn’t uninstall the old Store app, this one’s unusable with this scaling mess…
The Visual C++ SDK redist causing an automatic restart was lame. It was a troublesome behavior to catch in action for us, although you folks unfortunately lucked right into it. 
We’ve pushed out v1.1 which corrects this bit of nonsense.
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I’m sad to report this is still a thing. I took the PMP update 2.45.0.1028 today and some time after the update and using the app, my PC shut down with no warning. Not restarted; SHUT DOWN. Logs show Plex initiated the shutdown.
The process C:\Program Files\Plex\Plex Media Player\PlexMediaPlayer.exe (NAME) has initiated the power off of computer NAME on behalf of user DOMAIN\user for the following reason: No title for this reason could be found
Reason Code: 0x80040000
Shutdown Type: power off
Comment:
Nothing? This happened again today.
This is a thread about the Plex app for Windows/Mac desktop; you’re having issues with the (older) Plex Media Player.
You’ll need to go here: https://forums.plex.tv/c/plex-players/computers, create a new thread, and tag it with plex-media-player.
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