Maybe your Comcast router doesn't have a strong enough signal. Our Xfinity modem also has a built-in router, Arris TG862, about three years old. Since we don't have cable TV, we use Roku to stream programs to the TV from the computer in the room with the modem. Neither the Xfinity nor the Linksys router we used could transmit a strong enough signal to the television. We were constantly losing programs. So we installed a newer, more powerful router which then caused something called NAT and screwed up the network. After delving deep into Comcast's website support I learned how to turn off the router function in the Arris. It is now operates just as a modem and the new router carries a reliable signal to other parts of the house. Roku is happy and we are happy.
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