I just ordered these UM3X's from EBay (brand new) and they arrived less than a week ago. At first, they sounded great... but just today the 'high's' on the left earphone disappeared entirely. Plus it's the left earphone isn't as loud as the right side now (yes, I double checked that it wasn't my ears).
Has anyone experienced this with Westone UM3's? I'm not too happy -- these headphones were brand new and $360. Any quick fix or do I have to resort to complaining?