The problem for me with .45 was poorer wifi signal
What settings do you have in the pictures I present?
I'm not sure if this help you, you may want to try this there is no harm in trying (NOTE: 20Mhz on 2.4Ghz because I own quite a lot of Apple Devices and I own quite a few newer iPad Air/Mini 2 and iPhone 5S which connect to 5Ghz so not a big problem for me)
ASUS RT-AC66U F/W: 374.45
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