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I recently purchased the Netgear Nighthawk AC2100 for my parents. I have an Arris SB6141 and Comcast Xfinity internet(150MPS). I setup the router through the Genie and updated to the latest firmware: 1.2.0.36. I then performed a factor reset on both the modem and router, as recommended. My speed range is across the board. I have gotten as high as 180MPS, right after resetting the router, but this speed slowly degrades to about 60MPS. I can't figure how to maintain top speeds with this router/modem combination.
