Thanks for sharing this, I think I’ve had a similar issue to your freezing. I unintentionally transferred several gigs of files onto my MSFS/FSX SSD and ran it empty.
After showing “0kb Available” for the drive, neither MSFS or FSX would run. MSFS gave me a completely useless error message but I was 99% sure it was drive related because FSX now says it’s not an activated version - both problems started immediately after maxing out the drive.
Ugh.
I was able to fix MSFS after a lot of messing about but have been suffering a 1-2fps joyride shortly after take off so hopefully this may help.
(FSX is still broke 
)