i have exactly the same problem
sounds like humming coming from the front of the car
the problem occur when the car brakes are little bit hot/ driven for a while and at low speed
about 10-15mph, after i lift the clutch and speed up
when i check the brake rotor seems like it is warping or little scratch , not smooth (probably you want to check your rotors)
i brought to dealer when the car has 26 miles , then again at 100miles. they donot know what happened and when i brought to them the car seems fine, only after i change my oil ad the mechanic drove it , he realized the car definitely has humming sound , only for a while though
i schedule the car to be diagnosed and tested this week, i will keep update