Comcast admits they’re an internet provider, not Wi-Fi experts. I bought a high end router (ax technology such as Netgear ax12 line is upgradeable and handles lots of devices at once). Connect router by Ethernet then call Comcast and have them put their modem in bridge mode. Don’t use their Wi-Fi!! Also, turn off the xfinity free broadcast junk so no neighbors piggy back your bandwidth.
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