I don’t know what could be causing it. It doesn’t happen every time. I don’t know if it is normal for motion sensor lights.
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Sorry. I can’t help you
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I have no idea what that can be but maybe it has something to do with your cell phone microphone interfering??
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This is possible! My PC speakers do that when my phone is near and I have incoming messages etc.
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My phone can cause that? I don’t remember if my phone was near by when I first noticed the sound. There is no speaker on the book nook. Only a motion censor light.
Hmm I’m not sure sorry. Did you film with your phone? Maybe the mic of your phone is interacting with something somehow. 
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Sorry I can’t help with you with this
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My electric heater does that sound when it’sbeen running and then I turn it off. Some of my lamps too. I think it might be a surplus of electricity forcing its way in the circuit, when it’s not running, or not running “enough”? (it’s a fully personnal hypothesis, so take it with a grain of salt)
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I think it is possible. It sounds like an electrical sound. It happened when I turn it on sometimes. I haven’t owned any motion detectors before.
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A strange sound indeed! Sorry, I can’t help you.
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That seems fairly plausible. I think Electricity can make high pitched sounds.
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