Question --have we all seen any consistency with the type of devices dropping 5GHz wireless?
Are people having mainly problems with Apple (e.g., iPad, Macbook, etc)., or specific wifi chipsets (Intel, Broadcom, Atheros?)
Not asking for my sake, but trying to figure out for others if the issues they are reporting can be narrowed (e.g., an OSX issue, Intel 7260 driver, etc.). Most of my connection here is with an Intel 6300 on Windows 7 Enterprise (so, 802.11n 5GHz), but there's my Buffalo wireless bridge as well on AC 5GHz, and my work laptop (Intel 7260, Windows 8.1 Pro), and I haven't been having issues on 2769. I haven't upgraded to the new firmware yet. Note: I did have issues with several firmware prior to 2769, with 5GHz showing as connected, but providing no throughput. This lessened considerably with the firmware prior to 2769, and disappeared completely with 2769.
I have an iPhone 6 here, and haven't had any issues so far, but my use on the wifi has been minor. My outgoing Droid MAXX, well, I'd hope for better signal strength with it, but since moving the router upstairs, I haven't had dropouts on 5GHz. My wife has not complained of issues on her iPhone 5c.