Muddr, thank you very much for your reply. It got me started on the path that lead to what I’m tentatively calling success.
Basically, in my text file, there was a blank line between each of the desired lines. Hitting enter twice at the end of a desired line.
I have removed the blank lines, saved, and now have had a 100% success rate.
I knew it was going to be something simple and embarrassing. I could have sworn there was supposed to be a blank line between them. Guess not!
I’ll report back if it starts failing again, but I’m confident we got this one in the bag. Thanks everyone for your help and time!