I have tesrted multiple times and can consistently run 15 rows to a single output. 20 or more rows seems to fail with a "this is taking too long" message followed by the error that has been reported.
I suggest you use multiple output mode and then use
https://pdfmerge.w69b.com/ to combine the files. There seems to be an upper limit to the number of files that can be combined. I'm sorry, but at this time, I have not identified the limit.
I don't know why Autocrat started to fail. That is beyond my control.