[Elecraft] FLDIGI microphone level changes to 0

[N2ZDB at aol.com]

Last night I noticed that I had no audio input on my waterfall for  FLDIGI. 
 For some reason the recording microphone input level is  automatically 
switching to zero after a few seconds and I can't figure out  why?
 
Windows 10 Home Edition
FLDIGI 3.23.15 (an older version did the same)
 
I have the new KIO3B using the USB connection to my computer.
 
Does anyone know how to fix this?
 
Thank you,
 
Michael
n2zdb