Uh, Kevin, how long have you had the lights? Sounds like they are taking after you and are "demented"
Do they have rectifier packs on the cords? Could it be "sparking" in the rectifier packs, that sounds like clicking?
Realizing they are on the garage roof, but when you hear the "clicking", could you touch or feel the "wart", is it HOT not warm but HOT?
If so, due to them being dim, appears like the rectifier pack is going bad. Kind of like what some of us experienced with the CDI 2008 lights, right before they melted down and burst into flames. They also had a capacaitor in the pack, and the dimming would cause the circuits (rectifier, capacitor and resistor) to fail.
Kevin, to be safe, I would make sure those strings are unplugged tonight.
William, you help Kevin from the board level, and I'll blame the lights

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