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Maybe some incompatibility wiith 2.4 GHz and 7260AC at your location. Mine connects fine at both 2.4 and 5 GHz without disconnecting other 2.4 devices. Just for a possible but temporary fix, disable the 2.4 GHz by setting "Wireless Mode" to 802.11a only on the advanced settings located on the device properties.
Turning the Asus laptop with the 7260 AC card to 802.11g as well as turning off the 5Ghz radio on my router all 802.11b/g devices were able to connect. Unfortunately I'm no closer to determining the cause of my connection issues.
My Lenovo Win7 laptop with an Intel Centrino Advanced N-6205 connects to the 5Ghz spectrum w/o interferring to the other b/g devices w/o issue. Only the 7260 AC card operation causes issues.