It's reports like your that have stopped me sending mine in. Currently I cant seem to find fault with mine and I'm worried that sending it in means it could come back faulty. I was thinking of trying to send it in after Skomer in July......then I planned two trips in August..... Then mid September it's the start of the deer rut.....then October/November it's seals and owls. There never seems to be a good time.
There have been so many issues with new Nikon cameras over the last 4-5 years, I don't think a single camera that's not been a d3xxx or d5xxx series camera hasn't had a fault at some point especially early models. As far as I'm aware the d7000, d7100, d600, d800, d750 and d4 have all had problems. In some ways it seems that recent 'model updates ' like the d7200, d610, d810, d4s all were really done in someways to sort out issues. The cynic in me would say some of the issues were done just to entice people to upgrade (limiting buffer on d7100). The oil spots and constant AF issues haven't helped nikons reputation. That said cameras coming back faulty after recalls definitely shouldn't happen.