@astraith, I haven’t heard of any reports like this before on the communities here. Can you possibly provide a clip so we can take a listen and see what might be causing it? I know with my own devices it does pick up sounds from around the device - fans, AC, heaters, etc. all emit sounds that we sort of tune out but may be more prominent on a recording.
Could you also confirm that you are using the original included charging cable, wall charger, and that it is not through an extension cable? Interference could be occurring through that power line (not something I have ever seen happen with a Canary device, but it is something I have seen with other recording devices).