Digital certificate signatures disappearing in Adobe Acrobat (no error shown)

Hi all,

We’re experiencing an ongoing and very disruptive issue with Adobe Acrobat when reviewing and digitally signing PDFs.

What’s happening:

• While reviewing multiple PDFs and applying digital signatures, Acrobat frequently glitches.
• After signing and saving, the signature disappears with no error message.
• This forces users to re-open the document and re-sign, sometimes multiple times.
• Saving, editing, and signing actions are often slow or delayed, which seems related.

Impact:

• PDFs generated by instruments must be reviewed and digitally signed in Acrobat.
• It can take 1 to 5 attempts for a signature to actually persist.
• In ~99% of cases, there is no warning or error — the signature simply vanishes after save.

Environment notes:

• Issue occurs across multiple documents and sessions.
• Happens during normal review/sign workflows (not concurrent editing).
• Extremely time-consuming and risky for compliance-related documents.

Has anyone else encountered this?
Any known causes (cloud sync, autosave, incremental save, cert trust, protected mode, etc.) or recommended fixes would be greatly appreciated.

Thanks in advance.