Is it a graceful shutdown/restart, i.e. it warns you, or does it just turn off without ceremony? Because if it's the latter it could be overheating and need a blasting out with compressed air.
My install is on Win 7 64, via Steam and I don't see anything from Ubi, just the TWoS screen etc, so this could be a Win 10 related problem.
I see comments about running the game as admin, too, for me it prompts me each time.
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