@Garth5
My guess is that setting are such that Windows Update is enabled to awake the PCs to perform routing updates -- and since WU consumes LOTS of resources, the PCs are overheating and shutting down in the process.
You should read this to see if anything in it helps: https://techjourney.net/prevent-disable-windows-update-from-waking-up-pc-system/
Good Luck
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