I got that shutdown on my Silverstone 850W Titanium+ PSU… But after a few sim updates and patches I stopped getting them.
It’s especially true when I crank everything to ultra, so what I used to do is to drop it down to Medium-High, and to underclock my GPU down to at least -500 Mhz. It’s much more stable.
Until the latest update, now I run at stock GPU clock, and Set to Ultra with a few things dropped to High for the FPS. And I have pretty stable flights. I haven’t changed my PSU since the first time I built it 2 years ago.