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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.
A powered hub near the Yeti with a good power supply and a shorter cable in that last hop, again, *may* help but this is workaround territory (assuming this is leaking in from power fluctuations); if the thing is designed properly this should not be necessary.
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