Good evening Lynnette and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the error 500 creeping up on your site. Yikes!
I would love to help you with this topic.
Error 500 messages usually mean that the server cannot handle the request because of:
- Memory issues
- Timeout issues
- Corrupt .htaccess files
Since your memory seems fine, I would definitely take a look at the fact that your max_execution PHP time is currently set to zero (typically it should be at 30 or 300).
I would also take a look at your .htaccess file after that operation.
Finally, you might want to try this out with another custom post duplicator to see if that changes anything (e.g.: https://wordpress.org/plugins/duplicate-tec-event/ )
Let me know how that goes.
Best regards,
Geoff B.