I had 2 pairs with the same issue, after about 10 months, I started to lose sound because the cable didn't properly connect to the earphone. Just moving your head can make it disconnect.
I tried to change the cable with the second one provided and clean the connector, no luck. Spending extra money on a third party cable wouldn't have fixed my issue (I would have get a new set of cable from the warranty if it was the case, I got a brand new pair)
 
You've been warned, it's a great earphones, for less than a year...