I've had 3 out of 5 die of this problem within 2 years, (one used, two new). OTOH never had any problem with USB port, so I'd ask what ppl are doing there?? I suspect it's to do with humidity; all 3 died in the summer where we get 80-90% humidity normally. Luckily this summer was unusually cool and dry so hopefully my current unit will last longer