If you haven't tried it yet, try taking the bud off and blowing into the speakers. If that doesn't work, bang the broken earphone into your hand several times. These earphones have major condensation issues and as someone that owned a pair, I experienced it around 4 or 5 times (in 3 months).
That said, no long-term problems persisted, it was just very annoying as I could hardly use these after a shower or when sweating (unless I q-tipped my ears every time)... Anyone buying these earphones needs to be warned about the fault, it was pretty shocking when it happened the first time.
lol, been there, done that. That's why the right earpiece eventually sustained quite a bit of physical damage.. me banging the crap out of it trying to get the driver to start working again. Bottom line is either there's an inherent defect in the design, or a batch of defective units.