hi. i have the asus ac66 and i had installed the beta 359 firmware.The problem is that usually i cannot connect to the 5 ghz band but i can see it clearly.Sometimes i can connect with the 5 ghz band work for a little time without a problem and then again stops working without any reason.i tried also the dd-wrt firmware for this router but still the same problem.I dont know what to do!my laptop is a macbook pro retina , iphone 5 , ipad 4 and mac mini all with the same problem when you try to connect or when you connect but after a while the efficiency drops.Moreover i tried to tweak the professional mode of 5 ghz band but still with no effect.
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