Notification emails with PDF attachments stopped working

We are no longer receiving the PDF attachments via email for all submissions. It appears to be randomly dropping some of the attachments from the emails. Can you please check to see if there is something that we need to change?

Your form is using the new PDF editor but the form does not have any PDF documents. You just need to create a new PDF document and attach it to your email.
Please create a new PDF document for this form from this link. And attach it to your emails. Please contact us if the issue persists. 

Thank you for your response and the information on creating a custom form. We had the "default document" selected and we were receiving the PDF attachment with the emails, but not with every submission. I've included a sample screen shot of what we were receiving.

Sorry, but I was not able to replicate this issue on a cloned form and I was able to receive the PDF attachment. However, it seems that you have updated the PDF document and I am viewing it as follows:

I tested this form around 10 times and all 10 times, I received the PDF attachment as shown above with the email submission. Are you still facing this issue, since I can see that the attachment is working fine now?

Yes it is working now because I created the form based on your advice. The default form was being used before this new one was created, and the default form was the one that was causing inconsistent PDF attachments. Thank you.