In both instances, the left speaker (can) went out. I assume there is/was a broken wire in there somewhere. The same thing happened both times. Love the sound, love the fit, loved the sound isolation, but poorly made. I couldn't get the darn thing apart to try to see where the connection is bad, but I assume it is the connection on the right side. Before I threw the things in the dump, I snipped the left side wire and there was no signal coming in from the right side.
My Sony 7506's are new, and we'll see how those do--I have two pair now, one for a back up. I can't be without headphones for 10 days. We'll see how well these things hold up. Had to pay near list for the 1st pair and snagged a used pair for $40.
And I'm in love with the 7506s--great db isolation and good sound.