https://bugzilla.kernel.org/show_bug.cgi?id=201957
--- Comment #48 from i-am-not-a-robot@riseup.net --- This seems to be a firmware(-related) problem. After downgrading to linux firmware 2020-09-18, I'm running 6 days without a crash on the same work loads. (I was getting multiple crashes per day before).
My GPU is Vega8 Mobile (ThinkPad A485). Currently running 5.13.11.
An extensive discussion of different firmware versions in the context of a similar issue on Arch Forums: https://bbs.archlinux.org/viewtopic.php?id=266358&p=5