Worked for a while, but then just quit working for no reason.

I have purchased three sets of these and had to return one set. I was then sent another set and they worked for a while, but now three more of my lights quit working. I am really tired of having to return these lights because it does cost for me to return them. I don't understand why they just quit working because one day they are working and the next day they are not. When they do work, they look great, but having some light and others not light does not look good. I am thinking about returning the three that quit working, but I am just tired of returning them.

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