Hello guys first time posting!! So my sister has a 2014 RLX and upon driving it we had the weirdest thing happen anytime you get near too on at 2000 rpm the subwoofer decides to produce a hard bass note as if the music was playing no matter if the radio is on or off the second u let off the gas and the rpm adjusts it goes away I've looked online and haven't found a thing any help to point me where to look to figure this out will be appreciated thx guys!