Hi Joe,
I have an ASUS N551JK 125H with an Intel 7260 N Modul (Windows 8.1) and the latest Driver from Asus 17.0.6.1.
I had in the past also the latest Driver from Intel (Middle of Dez 2014, the Version No I don´t have in mind), either the standard driver from Microsoft 16.1 and the problem of loosing connection rate (at least 10 kb/s) was always reality.
Sometimes I had no problem, but some days I could throw out my new Laptop from the window. When I imagine, my old Dell Inspirion 9400 from 2006 with an Intel Card 4935 never had such problems like the Card from 2014/15!!
I have a Fritzbox AVM Router 7270 with the newest firmware and I´ve tried all the solutions written here in this thread, but the problem of low data rate is still there.
I can only resolve the problem, but restart the laptop (then the problem will come after some minutes or hours when i have luck) or i connect my samsung S3 phone by usb Tethering and then I can work perfectly.
I´ve written to Asus Support yet, but I think to solve problem, is the task of Intel.