NO real answer during my 4 hour repair attempt last eve. Blah, Blah (I did ALL the things a techie would have to do to get back on line 3Xs); morning, got indicators that modem was possible cause. Got NEW SB 6121 ..online instal confirm was pretty fast (Congrats Comcast), but it's still dropping intermittently since 0900 and I have to unplug and reboot, blah, blah. Speed tests confirm craziness.
Anyone else w/this scenario?