There’s yet another bug, dating back to at least February 13th by the looks of things, causing headaches to a select group of Access user and the symptom is that the lock file (ldb/laccdb) does not go away after the database or connection to the database is closed.
All I can say is that the Access Dev Team were made aware of the issue and we are told that a fix should be coming soon. Fingers crossed.
2020-03-03 – Official Workaround
Microsoft has finally published a page on the matter with a workaround to the issue. Refer to: Office error: Accdb remains locked after OLEDB connection is closed.
A Few Threads on the Subject
If you want to review some of the more recent threads reporting this issue, feel free to consult: