I believe I have experienced this but not quite in the exact way. I noticed there is an issue with ‘backup project’, and that in order to avoid any issues you need to fully shutdown Cubase immediately after doing a backup project, particularly when the files will get moved to a new folder.
I’m not sure if you are closing Cubase or not after backup.
The issue I think is that when you backup a project the audio files will be copied to the new folder, but the ones in memory won’t be.
Maybe try that and see if it helps. I made a thread about it somewhere here…
Here it is Backup Project keeps old Project Folder location
So maybe this is related maybe it isn’t, just a shot in the dark I guess. It could potentially cause a BSOD due to cause the Windows OS to try to write over files in memory… Not 100% sure