Revel Performa3 Cabinet Defect

Does anyone have experience with a Revel Performa 3 cabinet failure?  Specifically, F208 with fine, almost hairline width, vertical crack in the rear, from the very top (where the finished cabinet mates to the decorative black top cover), going vertically down almost to the crossover/input panel?  Again, the "crack" is hairline in width.  There are no signs of impact whatsover elsewhere on the cabinet.  Possibly a shrinkage issue if they were exposed to very cold ambient conditions in shipping and/or storage?  Dunno.  Just searching for anyone who's hade a similar experience.