Comment # 14 on bug 1123094 from David Walker

Taking a chance that smartd is the culprit, I disabled it with systemctl, and
the system has been running without problems for nearly 24 hours.

I also checked Mint by installing their smartmontools package and running
"smartctl -d ata -t long /dev/sda".  The disk became read-only, so this is not
an openSUSE-only issue and I will take it back to Fit-PC support.

Let me know if there's anything else you'd like me to try.  Otherwise, I'd say
it's OK to close this bug.  Thanks!

David