two in a row come dead on arrival . both would turn on and begin a power cycling loop , turn themselves off every minute or so . I would do quite a lot of research before pick this modem , quietly hope that the known power cycling issue would not affect this batch , but it be not the case . Amazon handle the shipment and return promptly , but it simply be not to be . after two return and hour waste on the phone with Comcast support , I give up and buy a different model . even a trivial amount of quality assurance should have catch this issue so I be far less than impressed with Motorola 's effort on this model .