If you are using the 5GHz band you will not get the distance coverage of the 2.4GHz band. The only advantage of 5GHz is no interferance of neighbering wireless networks and of course the speed advantage near the router. I had similar problem with a TC8305C gateway. The only way to get my Netgear N750 to work was to get Comcast to switch the gateway to Bridge Mode as there is simply no way to turn off wifi and dhcp in the webpage setup for the TC8308C. Bad mistake! Problems after problems for abouty a month. My fix was I purchased my own modem, an approved Comcast modem, Arris TM822C Touchtone Docsis 3 non wireless from Amazon. The only trouble I had with comcast was getting the monthly modem rental removed from my bill. My service now is rock solid. I have Exreme 105 speed tier and all my devices are happy ;)
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