Of the 3 persons I gave these to, 2 of them reported one side of the driver is not working after 2 months (similar as you). On closer inspection of the IEM, the cable strain relief connecting to the driver slightly gave way (slight broke). I believe this is a common problem.
The 3rd person who's pair is still working has treated them very well since June '12. Whereas the 2 that had broke had thrown them around and more rough on the cables and it broke less than 2 months.
The 4th person which I did not mention, is me
and its still working fine after 7 months of use (since May '12). Cross my fingers and hope I didn't jinxed it. I take them out most of the time too. Kept them in a box or lay them flat when not in use. I always hold them by the drivers and avoid straining the cables. However, I can imagine if someone's earlobes are thicker, it would still bend the cable on wearing it and probably naturally wearing it out over time. I do agree these things aren't durable and those who are considering them should take not on the durability. I noticed it from the moment I got my hands on em. I generally baby all my IEMs anyway, so I think I've been lucky so far.
Btw, on a side note, listening the HD381B through iBasso D4 Mamba DAC I noticed that the bass can hit
pretty darn low and its also tight and controlled as well. I'm
really liking the bass here. For me, my preferred sound signature in the series. If this pair broke, which I think it will eventually (just a matter of when), I would buy another replacement, no questions about it.
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Left driver out. Not working. Sadly. 75 days work, all that. Not buy this.