I have had this same issue since day one. My vanity lights in the bathroom would do this flickering at random. Found the culprit to be the bidet as it was heating the small water tank. If I ran an extension cord to the bidet from a 15 amp circuit such as in the bedroom I would see the flicker with the bathroom lights that are on the same circuit. If I plugged the bidet into one of the plugs around the bathroom sink which is a 20amp circuit no flicker in the lights.
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