Crackle with H4n as usb i/o

I'm getting digital crackling when rocerding - most of the time but not alwayds (especially insane making)
details with sample: http://www.smallwoodenshoe.org/mic-noise/
Set up:
Shure 7B > Zoom H4n > USB Port to MacBook Pro 2009 2.53GHz 8G RAM > Skype (updated) > Call recorded (updated)
This session crackle started fairly consistently at 45 seconds into the call.
I don't hear it in the monitoring from the Zoom
We have been successful in the past. And even after this. But what causes or solves it is unclear.
Same in Logic Pro X and Audition.
Settings (44.1 etc...) appear the same)
Have tried:
Different cable
Restarting everything
Different combinations of connecting H4 to computer.
Thanks for any thoughts.

Have you tried a higher I/O buffer setting?
Logic Pro>Preferences>Audio>Devices>Coreaudio

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