Yes, I have 4 C7s. They all have the same SSID / password. I set the channel to be different to avoid interference. I'm not sure this matters anyway...the default setting is to auto-select? Perhaps I...

I updated the post with my hardware version. I don't believe the Surfboard6141 acts as a router (or does NAT). Also it's strange that this connectivity/throughput is limited to wireless connections.

Model : Archer C7 Hardware Version : Archer C7 v2 00000000 Firmware Version : 3.15.2 Build 170525 Rel.37571n ISP : Current setup is Modem: Arris Surfboard 6141 Router: Archer C7, DHCP on / NAT on...