Please help identify this sound

Hello - I just purchased a new vehicle. The first time I drove on the highway (day 3 of ownership) I heard this sound (attached). I called the dealership and they said to bring it to service. For the first 2 seconds or so you'll hear the general background noise before the louder/problematic sound starts.

{edit, I added link to the sound: https://www.youtube.com/watch?v=k1_e70BpH3U }

Hope this turns out to be a minor problem.

Thank you very much.