I have the exact same problem, but I was convinced it was air coming through the firewall where my radar detector wires were coming into the cabin. Therefore I was hesitant to take it in for warranty complaint. Let us know what the dealer finds on yours after they look at it. I also have a 2014 with nearly the same amount of miles. It's always at about 70+ MPH on the highway, and seems to be louder when it's cold or windy outside.
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