I've never heard anything like this in one of my TTs. I'd remove the access panels with power off and make sure everything is connected tightly. Since you are under warranty maybe you can call them and do a quick drive by. Let us know what you find.
2016 Passport GT 2810BHS, 2016 F350 CC DRW
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Tom
2019 Alpine 3651RL
2016 F350 CC DRW
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