Random audio degradation in the middle of recording

MacBook Pro with USB mic. I have tried a Blue snowball and another broadcast quality mic connected via USB. While recording, the audio will suddenly degrade and become unusable. I have no idea this is happening until after I'm done recording and go back to listen. Once it starts it keeps going till I finish. There doesn't seem to be a pattern for when it starts. It doesn't 'always' happen. I frequently record 30-40 minute podcasts and they are ruined by this. Any ideas at all would be helpful.

I'm having the same sound recording issues - seems like these is a USB codec issue with Macs - this is what I gathered from other post, I'll be testing tonight -
Option 1 -
Change Date and Time in system preferences from automatic (internet) to manual.
Option 2 -
Just open up the audio midi setup in your applications/utilities folder and change the default input and output to USB AUDIO CODEC and make sure that format on the input and output side is set to 48000.0 Hz.
Option 3 -
turning off the airport and bluetooth on the computer
Option 4 -
go to Apps/Utilities/Audio Midi Setup. In the Audio menu there is an entry "Open Aggregate Device Editor". Click that.
In the dialog, click the + button at the bottom of the list, which was empty on my machine.
It will add a new device and in the bottom pane all the sound devices in your computer will show up. Only check the ones you want to use (USB audio). Then use the Clock radio button and select one of the USB devices as the clock source (I used the output).
Click Done.
Now set your default input and output to "Aggregate Device".

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