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Pulsating/Fluttering sound during regen breaking after fast acceleration

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After some hard acceleration and then letting the regen slow the car down, there is a pulsating/fluttering sound coming from the rear area/rear motor as the car prepares to come to a complete stop.

The best way I can explain it is a fan that's running at high speed where you don't notice the sound of the blades until it slows down, going from a HUM to a slow paced woosh woosh woosh noise. 🤷‍♂️

Trying to determine if it's normal and if others experience this.