There have been other posts over the years about problems with Kingston cards in Nikons. They make great memory products, and I wouldn't hesitate to put Kingston memory in one of my computers. Most of the posts just disputed the advertised speed for write or read vs. the actual speed.
Nikon specifically, on page 435 of the manual, gives you their recommendations for CF cards in the D800. I bought a couple of Lexar cards for my new but returned D800. I think that I like the Sandisk better and had been using them trouble free in my D700 and now in my D3s.