Thank you for your response.
I don't have the luxury of waiting to see if it continues to fail - this is the only job showing this behavior and it only runs once a day. When it fails, I simply delete the files and the issue is resolved. I suspect that I don't even have to delete the file to see it resolve, but because it generates external notifications, I cannot easily verify that.
However, since I posted this question the job has run without issue every night. At this point, I'm willing to wait until we can upgrade the point release and see if it really is gone.
I'll hop back if it shows up again, and I will try and see if I can re-run it without manually deleting the files (we'll play some sort of game with our SMTP server or something).
Thanks,
Don