I have been experimenting with the CTDs as well. After some undervolting, I could play in VR for 2 hours and even with returning to the world map and starting another one two times. So far this would be guaranteed to CTD, but didn’t. Now here is the strange part:
Apparently, I forgot to save the undervolting profile for MSFS and when I started the sim a day later, there were no CTDs, but the card didn’t use the profile and therefore ran at base settings.