I have the same problem and suspect it is a light that's out at the top section. Where do I find the Trim-A-Tree lights?
Same problem but many more lights involved. buy the $20 product called "light keeper pro" and follow the instructions. this device fixes this problem by either flashing a charge through the burned out section to 'heal' a failed shunt. if that doesn't work you can trace the current with the device to find where it is interrupted. the device chirps when it senses the 60 cycle hum of the a.c. current. replace buned out lights as soon as you find them as they cause an overload in the remaining lights in that circuit.
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