Might just be the insects in your garden
Actually, I get that about half the time before a bad spell.
I think of it as a precursor. I know that I have a couple of days to get my things done before I "take a break". When I hear it, it is often at night and usually keeps me awake. It is annoying. Actually my service dog, an English Mastiff, snores so loudly that you would think the ringing/buzzing would not bother me.
As stated previously, I take it as a cue that I will need to take it easy. Once my body is stress free and rested, the noise goes away.
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