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Intermittent buzz when recording using Focusrite Scarlett Duo

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Topic Intermittent buzz when recording using Focusrite Scarlett Duo
For days now, I’ve been getting intermittent buzz when recording using the following gear: Rode NT1 direct into Focusrite Scarlett Duo, into a laptop (Acer I5 running Windows 10) running Audacity. The buzz is relatively slow (that is, it is not a hum). It’s a bit like a two-stroke petrol engine you might find on a model airplane but very quiet (about -20db when it gets bad). Deactivating phantom power gets rid of it for a while, then it comes back. My input levels have to be quite high to get a decent recording level: the gain nob on the Scarlett is set at about 3’o-clock (75%) and audacity is set to -0.86. The buzz seems less intrusive when the laptop is on mains power, and not on battery.
Any ideas?
In advance, thanks for your thoughts.