My dell xps 13 9360 (service tag ) has this "soft" beep that occurs randomly.  I updated my bios version to the latest version (2.12.0).  I also ran the built-in diagnostic tool (via the F12 key) and my laptop passed all tests.  And here is the kicker, this beeping occurs even on the bios screen!  It was even beeping during the diagnostic tests!  -- So, I'm sure it's nothing to due with the os.  Does anyone know a way of diagnosing this?