If you’re swapping between wheels and hence rotors it could be that the pads are slightly hooked over where they overlap the rotor on the one and this gives a bit of a bounce of the pad when it’s on the wavy rotor. Either this or like mine, the rotor overlaps on the inside of the ring and because it wears less where it overlaps, it bounces over the spokes whenever they encounter them.
My solution was to take the pads off and file a chamfer into the bit that was raised meaning it would last longer before needing doing again.
Hope that makes sense, if not I may have to do pictures.
Gaz