Word getting error message

I have also received this error numerous times. My working theory is the because the new files take slightly longer to open, when DMS treats them like normal small files, but Word doesn't open it immediately, DMS pulls it from temp, and that leaves Word to treat the locked/missing file as if someone else is using it exclusively.

Keeping the database in good repair, opening the old (2003 and prior) format files, and having Word already open seems to greatly improve reliability.