I have reported a problem here a couple of times in that a week or so ago my sim seems to have stopped in all but challenge mode.
It turns out that the Sim Rate is 0.0625 which I have determined using an external app. I can do a temp. force to min x1 using the app which causes the Sim to run at normal rate and removes the problem.
MSFS keeps trying to switch it back to 0.0625 so it is not a real fix, just shows what the issue is.
Is there a setting in a config file etc. that may be causing this or some other “hard coded” sim rate setting.
With this issue the sim is 100% unusable.