D600 . AF in tungsten light

I think in time this will be the next "D800/D4 Left AF Saga"-type of defective camera saga. Wonder whether this is even a defect to begin with. No concrete evidence that this is beyond an inherent design limitation. Some have suggested a sub-mirror adjustment and I am in the midst of investigating that (nikon tech in my country are denying this possibility, AS ALWAYS!)

http://forums.dpreview.com/forums/post/50536972