here's my sad story: $400 Shure earbuds went out in one channel for the entire warranty period (2 yers) I think they replaced them 3 times. I was so frustrated I recently bought the Sennheiser IE8. In less than a month the sound seriously diminished in both channels, especially the left. Yes, I can return them under warranty but my Q is: why is this happening. I'm a librarian, not using them in a sports environment. I wear the buds around my neck with the iPod in holder......do you think I keep causing these dysfunctions or what? suz