My daughter's third one has just frozen - which is what happened to the last 2. I say frozen, you can hear something whirring trying to happen, but nothing does.
While we were in the Apple Store there were other people coming in with the same problem - this is when the second one was being resolved. So we are off next week to see if they can resolve it.
Mine works fine, I use it for about 40 minutes a day, my elder daughter's one is also fine - she uses hers less than me. The one that has gone wrong is used for a couple of hours every day - and sometimes even longer. My daughters have the large one, I have the medium one - you can see I have the terminology at the tip of my fingers!
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