My Vega64 was also 100% stable on the exact same build under Windows 10. So I
am also not getting my hopes up, but I am really frustrated. I am hoping it is
some kind of incompatibility problem. I have honestly tried so many things,
that I am willing to give the long-shots a chance as well. 

Since my Switch to Linux ~1.5 years ago, stability with the Vega64 has been
very finicky. Some games run fine, while some games cause this crash pretty
reliably. Very, very frustrating.