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Mine seem to take "spells" where the electric motor will begin making an unusual grinding noise. This most often occurs AFTER I've had the tray out candling eggs or doing some other manipulation with it. I always figured it that I had just gotten it in a slight bind and the motor was having to work a little harder than it was designed to. Just give it a gentle twist (or otherwise reposition it) in the incubator and see if it doesn't stop.David