I am afraid, both these options cannot be done since it is a PRD environment and we do not have access.

Can you please let us know how does pd4ML embed the fonts into the PDF. Does it store the fonts files into temp folders some where on the linux server or does it load it into RAM memory and then tries to fetch it from there?
The reason I ask is because, the issue PDF shows the Times Roman and Times Bold but does not say it as EMBEDDED when i look at the Document Properties option in Acrobat Reader DC. But the non-issue reports has these fonts as embedded.

Can too much of traffic or any memory leaks cause these issues with PD4ML?