File formats include jpeg, Word and Excel documents, and PDFs. Documents have come from downloads, email attachments, and documents created locally. Performed a full scan today which found no results. Performed a system refresh and no improvement. These are documents I've opened, edited, saved, sometimes reopened and used, and later, they randomly aren't working.
Currently saving all documents on the MicroSD card to keep the SSD drive as free as possible on the Surface.
Downloading a firmware update as I type this.
Thanks in advance.