I've had a few sets of NT01's, and have actually experienced this on a single tire. The tire was actually date stamped 2007, so doesn't jive w the recent built date phenomenon.
I just mounted it the side of my car which wouldn't "lift" or "separate" the tread any more when spinning the tires. I monitored it, and as the tread wore down from track days, it became barely noticeable.
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