Christopher,
I'm sad to say this issue appears to have come back / never really was fixed.
Since my last post, I noticed maybe once a week an SMART item appearing in the logs, but since a Windows update / reboot last night, I've seen about 10 errors in 12 hours. After another reboot, the problem doesn't seem quite as enthusiastic, but does still seem to occur. I've got email notifications off, so it's not spamming me to death, but it also forces me to keep email notifications off. ;-)
Hopefully this additional data helps identify / isolate the problem.
Regards,
Philip