Does that confirm your suspicion that it's a coating problem?
On a separate note, after some more critical listening to my X1, and with different sources + a carbon KGSSHV / the included 270s, I can't get the violins to be present. Even with EQ, they're always soft and positioned far behind other instruments (piano / wind), despite the violin being the centerpiece of the track.
Otherwise I generally like them for the price.