I was getting full speeds of 200MB/s or more from my XR300 up until about 3 weeks ago. nothign changed with my isp. My modem was not up to snuff as it was also gettting slower speeds so I bought a new modem that can support 400MB/s on my ISP. when connected to the modem, I get full speeds again but not through my router. I have tried with DumaOS off and on. still getting between 60-90MB/s now. i updated to latest firmware and no fix. please help.