If you are experiencing the same 10% misfocsuing with all FL and all lenses, and the full reset does not solve it, I would think the odds of it needing a minor adjustment are pretty high. If it happens intermittently, the odds of it being contact oxidation on the camera lens mount as Brian mentioned. Cleaning is not usually needed with intermittent contacts and can make it worse. Some suggest using a pencil erase but they will make the contacts less reliable permanently by increasing contact resistance due to scoring. When people say "cleaning" contacts, they mean de-oxidizing which is not done with solvents and cleaners but with a de-oxidizing agent such as Craig Laboratories D-5 De-Oxit. If the problem is consistent however, there is a good chance that it need a simple mechanical alignment by a service center. If handled roughly or dropped there is a good chance of changing the mirror angle or other mechanical adjustment.
One suggestion that applies to all posters seeking solutions, to get more people to answer or even read your question try not to post titles that are inflammatory assertions that most people know is false. They would tend to bypass such a post without reading. The D7000 is an excellent system and its Multicam4800DX AF is one of the many reasons it is. Somewhere in your system that many involves many components(lenses, light level, settings, camera, operator, target characteristics etc) has a problem, but that does not support any claim that D7000's in general have a real issue. Clearly that is false and assuming that it does will cause you to overlook more important evidence is determining the problem. What you and we do know is that you are now getting out of focus captures, due to what, you, and we, will not know without more evidence.