I just received this from the client and I think it is .NET install for sure.
I forwarded this on to Sage support too.
Related to the sage advisor update - here is the log screenshot. See 'Comment:' at the bottom of the description. There's also a load of logs showing several events leading up to the restart and what Sage Advisor was trying to do.

..
As far as windows updates go, here is what I found. It looks like some windows updates did go through, but the timestamps lead me to believe that they were just installed due to the sage advisor kicking off the reboot. They happened during / after reboot.

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David Overholt
Programmer/Project Manager
DWD Technology Group
Fort Wayne IN
(260) 399-8655
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Original Message:
Sent: 10-27-2025 13:59
From: Brett Zimmerman
Subject: Sage 100 and server reboot
Seems like it might be .NET-related, primarily because of the times the computer/server sometimes auto-reboots after Sage 100 prerequisites are installed, in particular .NET (although haven't really seen that happen in a while). So maybe there was some sort of .NET update, and upon launching Sage 100 that triggered a similar thing?
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Brett Zimmerman
Net at Work
Greater Boston Area
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Original Message:
Sent: 10-27-2025 13:31
From: David Overholt
Subject: Sage 100 and server reboot
I know that
@Madeline Stefanou said she was going to open a case with Sage.
I just got off the phone after opening a case with Sage support.
Sage's first answer was "Sage 100 is not able to reboot the server" I was talking to entry-level tech and she was messaging a higher-level tech. I told her to take down the exact message that IT found tied to the reboot. "The windows installer initiated a system restart to complete or continue the configuration of 'Sage Advisor Update'."
She did that and sent it to the him/her, but after that, she told me that they were escalating it and someone would call me back.
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David Overholt
Programmer/Project Manager
DWD Technology Group
Fort Wayne IN
(260) 399-8655
Original Message:
Sent: 10-27-2025 12:44
From: Barbara Goldstein
Subject: Sage 100 and server reboot
I had this happen one day last week. Windows 2019 server. Nothing in the Activity Log. I believe I was the only one logged in, as no one reached out to me, and no one logged in within the 5-10 minutes I was on (thankfully). No CC processing. A GL/AR/AP 2-user system. Sage Advisor uninstalled when I upgraded them a couple weeks ago to 2025.1. No Windows updates that week.
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Barbara Goldstein
Sr. Consultant
DSD Business Systems
Original Message:
Sent: 10-27-2025 12:39
From: Wayne Schulz
Subject: Sage 100 and server reboot
Now that I think about this, I did have an IT person contact me about two weeks ago wanting to have me stand by while they answered yes to a bunch of pop-ups that were on their server. They were all UAC-type prompts and when we cleared one of them (answered Yes), I thought it was odd because it did reboot the server. I could swear in the background I saw something about .net component or some type of Microsoft component was updating. This was while working directly on a Sage 100 2024 Advanced server doing nothing except answering yes to what appeared to be routine UAC prompts.
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Wayne Schulz
wayne@s-consult.com
Schulz Consulting
(860) 516-8990
Connecticut