I dont recall having a crackling or poping sound when there is no music playing, if there is no sound how do you know its crackling and popping? I never had this problem the 1-2 weeks I own the Ether 2.
My Ether prime right xlr port wears out, music start cutting in and out and eventually stop working one day, I dont know the reason behind it, it just happen. Similarly, why do car with good maintenance record break down? it just happen. Again, if you are worry send it in, or return the headphone.