I recently returned from a wonderful trip to the Yucatan. While there, my two D7000 bodies performed well, except for two problems. First, my four brand new Sandisk 32 gb memory cards could not be read! (Luckily I brought others). Second, my plan to use the second card slot as a jpeg backup went awry, as the camera kept resetting this function.
I discussed this with a friend of mine, whose first words were "Have you updated your firmware?"
I confessed that this was one task on my list of things to do before my trip which I did not get around to doing. We looked at the Nikon website for firmware upgrades, and these two issues were addressed with the firmware update of November 9, 2011.
I updated the firmware today (easy to do with instructions on the Nikon website), and the problems seemed to have resolved.
(Yucatan photos coming soon!)