This has happened 3 or 4 times so far.
It starts like this:
I connect my VA to my PC in order to sync and charge.
Sometimes it's OK and other times, my PC (Windows 10 Anniversary Edition 64bit) reports there is a problem with the drive and that I should scan and fix it.
I choose to scan it and I get a BSOD. The BSOD says the error is in FASTFAT.sys.
When I reboot, the devices are blown away in Express so I have to set them up again.
I believe others have had something similar to this happen over the years. I'm hoping they remember what they did to fix it.