SAGE random pdf export cannot be opened

Hello,

We are having an issue with exporting reports to a pdf file. Random reports will not open and acrobat gives the message "Adobe Acrobat could not open 'name_of_file.pdf' because it is either not a supported file type or because the file has been damaged...".  There is no identifying pattern and it just happens randomly.  However, it opens fine when we export a second time.

I have tried searching for an answer but cannot find anything on this specific issue.  

Can anyone help in pointing me in the right direction?

Any help will be appreciated!

Thank you.