Every so often Forms are not being sent as pdf after submission?

You must be referring to the Autofill feature of the form.

Here is the user guide: How-to-Enable-Auto-Fill-Feature

Please take note that once the form was finally submitted, the saved session will be cleared. So it will no longer be available next time the form is loaded on the same browser.

If you need istead to go back to the exising submission data outside the View submission panel, you can use instead the Edit link of the form.

User guide: How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date

Let us know if you need further help.

It is not the auto fill feature that works fine.

Every so often it will not generate and email the pdf form?

Sometimes it works, sometimes it does not work.

Seems very unreliable?

Hello Garry,

Thanks for reaching out to Jotform Support. I moved your other question to a new thread and helped you with that here.

Reach out again if you have any other questions