I have a  Motorola SB6120 SURFboard DOCSIS 3.0 eXtreme Broadband Cable Modem  not long after that I move and the modem work again . . Great must of only be that one place ... nope ! start to reset at my new place with Comcast . . Ok order this modem , which be use by Comcast and so far nothing but perfect internet connection . I get 22 Megabit DL connection , 4 ul . not a single reset or problem . at one point I do have a problem but it turn out to be my surge protector the cable be pass through . highly recommend !!