Stopped working after less than 2 months

I ordered 4 sets of these lights for the palm trees in my backyard and wrapped the trees the first week of January. It’s now the last week of February, barely 2 months later, and 2 of the 4 sets have completely stopped working. I’ve checked the switches, wires, etc. but they are 100% dead. I’m incredibly dissatisfied. Also as a side note, the “cool white” lights actually appear blue, not white at all. These lights are junk.

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