I just set up my router after moving. I have Xfinity 600mbps internet. Directly connected into the router and over wifi Im only able to get 91mbps MAX. Ive tried all the advice that Ive found on here and nothing has worked. Ive tried the beta Firmware and still the same slow speeds. I can plug into the back of the modem and get 600+mbps. Plug the router back in and back down to 91mbps. I used the router with another provider before Xfinity without issues. I see that for the Internet Negotiation speed for the internet port is only 100mbps full. How do I change that? Ive tried different cables.