FS now running fine, no shutdowns. Fitted new Corsair HX1000i PSU yesterday.
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I know this is old, I changed my PSU from corsiar RM850X to Asus 750W and STIFF shutting down, ONLY MSFS2020 does this
You downgraded the PSU wattage?
I found that even with my old 5800X3D and 3090 Ti and all the other peripheral devices I was seeing up to 680W total power draw (as reported by my UPS.) Thing is, there’s no way to track instantaneous spikes in power draw without a fairly sophisticated volt/amp recorder. I never had any problems with a 1000W PSU, but I’d be concerned if I only had 750W on tap.
what about the 850 watt also doing the same?
Probably need a 1000W+. Solved my issues. (Hence not having posted again in this thread for 2 years.) 
actually it was the gpu thermal paste not working NOT the PSU like everyone said
Cool deal finding the issue. Do you use any temp monitors/loggers? If not, I recommend CPUID HW monitor for overall system monitoring, or good ole MSI afterburner for GPU monitoring, but I use Asus GPU Tweak III since I have an Asus card. I used the latter to find and log voltage spikes/drops before shutdowns in MSFS. Weirdly, the on Seasonic PSU I had worked fine for everything but FS. In fact, it’s now powering another computer here without issue.
i used core temp, but iot wouldnt see the temps before shutdown