Me too. thing happening with router D Link. Sometimes the laptop does not see it. But the same time see the hardware Apple smartphone, Apple I pod, Samsung Tab, Samsung smartphone. tech service did not help. He did not accept it as a defect because other aparatury work fine.
I turn off the camera, perevorachivayut its top on down, knock Paltz a few times, and turn on the same position. When apart already seen from Dell, then you'd get along right. Already in a row two router I got. But it's not okonchatelnoe decision.