[Elecraft] Loud burst of audio

[Roy Davis]

 have the MCU 02.67 version in my #1366 K3.  I have not readily seen any
 problems with this version.  However today, I have noticed that at various
 times that a a loud burst of audio emits for a split second.  This is not 
on
 powering up, but with the unit just setting on the desk receiving.  This is
 happening whether there is an external speaker attached or not.

 Has anyone had this to happen or know what could be causing this to happen?

 Thanks,

 Roy - WK4Y
K3 -1366