I've been playing for a few days. At first everything was very smooth. Then game started to lag, and now starting late yesterday, it shuts my computer off out of the blue. Just bam - no power.
It sounds like a similar issue from the first game:
https://forums.obsidian.net/topic/72006-shuts-down-computer/page-1
It doesn't seem to be an overheating issue - it recently shut the computer down as soon as I loaded the game; other times I can play for a couple of hours or more.
Forum isn't letting me upload the save game file, but I'm attaching the output log and specs.
Editing to add: Now it's doing it as soon as I load the game and click on something, every time. Please tell me there's a fix for this.
output_log.txt
DxDiag.txt