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Grid instability can cause this in direct grid-sync clocks... but that's mostly those cheap clock-radio things that people mostly don't have anymore. You mostly see them in older hotels now.
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I think or might know, but I think cheap devices these days probably use a non-grid clock chip, and if they sync at all, it's over wifi (which is more stably synced with GPS via explicit time calibration signals rather than 60/50hz assumption.
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Might it have something to do with the movement & instability of the magnetic field right now? He lives in Glasgow, closer latitudinally to Siberia, instability in the electromagnetic field triggering a little spark of cosmic rays?
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Doubt it... probably old appliances that are directly grid synchronized and their grid is unstable. Been happening a lot lately due to the drastic shift in electricity usage patterns.
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