I have tried WNDR4500 and R7000 (both netgear) routers, and same thing happens. I am connected to an Arris CM820 modem for xfinity.
On both wired and wirless connections to the router, I get very slow download and upload speeds. Speed Test sometimes shows less than 1mbit down! If I reboot modem and router, its fixed for a few hours to days. I have PC connected via gigabit LAN to the router, and even that is slow. Comcast guy came out and swapped out the modem (but for the same exact model).
The WNDR4500 was working for about a year before this slowdown started happening more often. I have tried two diffrent R7000 (both brand new, less than a week old).
