Buzz/humming when driving RDX
 

Hi everyone trying to figure out what the noises before I take it in. I bought the car used with around 30,000 miles. And now has a little over 100,000 miles. It’s under a car max extended warranty for another 20,000 miles. Before I take it in trying to figure out what this could be/if I can fix myself. There’s a slight buzzing noise almost like a mechanical sound that happens when I first start the car up and drive. The noise happens at around 20 miles an hour it only happens for a few seconds and then goes away the noise always happens at the 20 mph. Trying to catch a video you can hear it faintly if you listen it’s a buzzzzz sound. Any help would be fantastic just trying to out my mind at ease!
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What year RDX?