When I turn on my headphones, I hear this constant quiet static noise in the background (with noise cancelling off). The headphones never sound completely quiet. It doesn't matter how it is connected (bluetooth or wired). When noise cancelling is on, it is much louder and apparent. Instead of just cancelling out outside noise, it replaces it with this constant static instead. And then when ambient sound is turned on, there is also the static noise. Does this happen to anyone else? Are they defectve?