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If the Yeti is connected via USB and nothing else, then this is an internal fault or poor design. This stuff is nigh unavoidable when there is a loop, but for stand-alone USB peripherals it should not happen with good electrical design and filtering.
If you have any other connections from the Yeti to other devices which are not completely stand-alone, then that is likely the problem (e.g. passive headphones plugged directly into a headphones out = OK, but a mains powered amp in between = bad).
But yes, that is very much USB, so if the Yeti is picking that up alone, there is nothing you can do to fix it other than take it apart and improve the electronics.
A better/beefier/shorter USB cable *may* help depending on how it's implemented and what the exact problem is.
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