Atmel Dataflash (AT45DB642) anyone experienced stuck bits?

I have been using the 8MB, AT45DB642, from Atmel for a number of years now. It has become apparent that some of the chips we use have stuck bits at various locations. So far this has exhibited itself in two forms.

(1) a consistent pattern that occurs through every one of the 8192 pages.

(2) a random scattering throughout a portion of the memory.

Anyone experienced something like this or are my sources of chips coming from the "gray market"?
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