Coil Failures

For about three years now we, that's myself my wife, my daughter and my son have been using Aspire coils, specifically the nautilus mini coils. Can someone please explain why the quality is so hit and miss? Some last a week or more, sadly many of them just a day or two which is not really acceptable as they are now £2 each. We always try and buy from reputable sources and ALWAYS check the scratch panel.
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