WiFi is complicated since mine works perfectly at both bands, regardless of channel width with 16.8.0.6 Dell drivers without changing the default settings whatsoever. It might be that recent Windows updates or manufacturer's proprietary drivers and software have somehow conflicted with WiFi N but I'm just speculating. I used to have speed problems with 7260 N WiFi (never had disconnections though) but since 3 months ago it has been working like it should in the first place. I've been connected to WiFi with my laptop for 9 1/2 days and counting and it has never given me problems at all since the dell drivers and January 2014 windows updates were released.
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