We have noticed similar problems on qa-power8-5. It seemed stable at the beginning (see my initial bug report) but at some point it crashed in the same way. I have downgraded only the kernel of qa-power8-5 to 5.8 (see https://progress.opensuse.org/issues/114565#note-43). After that qa-power8-5 seems to be stable again. So likely the kernel regression was introduced after 5.8.