When saving documents it randomly error's. We have 2 functions that call this, they are financial docs a privacy notice and a credit disclosure. They are generated then saved ans sent to customers 9/5/2018 from 11 customers 2 failed one failed at the first document the send failed at the second document. Code below.
var pnPages = page2.getDocumentCatalog().getAllPages();
string fileName = "Credit_Score_Disclosure_" + borrowerName + "_";
string fullFileName = System.IO.Path.GetTempPath() + fileName + Guid.NewGuid() + ".pdf";
There is a try catch around the code which is how we collect the failure. We have the blank file it creates so it gets as far as the save then errors.