Ray, if you search Flax or Flaxseed on our Forum (using the search tab, upper left, NOT the box on the upper right), you should find that over the years, there have been many folks that have come to us for help and assistance when their beautifully seasoned skillets begin to release black flakes into the food. Many times, these reports are on pieces that have been in use for up to one year before any problems occurred.
The common denominator has been.... originally seasoned with Flax Oil.
And stripping Flax Oil can be a real challenge when it is necessary to re-season.
So, there are other known oils out there that work as well, or better, that hold up over time. :)