Hoorah! At last someone with the same issue. I didn’t mean hoorah for your misery but I really thought I was alone and going mad.
I have now tried just about everything possible from a hardware related perspective trying to diagnose this issue over months.
As I have 2 HP Reverb G2 headsets and they both exhibit exactly the same issue I can pretty much say that it isn’t a hardware issue. Yes I have tried all versions of the cable including the new power switch version.
I have an externally powered usb3 hub too.
I have uninstalled and re-installed MSFS2020 several times on different nvme.2 hard drives with no effect. I have disabled/deleted/moved the community folder and that had no effect.
I thought it was only happening on add-on aircraft but that isn’t so either as it happens on all aircraft.
I had an ethernet cable run under my home to facilitate a constant connection to my router in case of wi-fi dropouts - No change.
The change to a 1440p from 4K monitor freed up more resources from my i910900k/RTX 3090 system but that had no effect either.
No matter what settings you use it still happens.
So the only thing left that I can put it down to is some sort of software conflict.
Last night I disabled Corsair iCue as I remember it had some issues crashing the sim a few versions ago due to some included Lenovo drivers.
At first it seemed to work as I flew my Mkix Spitfire for a couple of turns of the Mach Loop.
Then I swapped to the F-14 Tomcat and suffered 2 small blackouts but no hangs on the same route.
I am going to continue testing minimal app running system to see if I can find any program causing an issue but am not really confident.
As you have only begun to experience this issue I wonder if you can catalogue any changes you made to the system prior to this happening.
Also any background programs running that we might have in common.
I too have steam VR and Windows Mixed Reality Portal for Steam VR installed although not running when accessing MSFS which was purchased direct from MS store.
And I can confirm that no other Sims…X-plane 11 or IL-2 Sturmovik, Elite dangerous Odyssey or games such as Half Life Alyx suffer from this issue.
Let’s see if we can find the culprit together.