like most here , I have purchase this modem to replace rental modem from Comcast -lrb- $ 7\/month -rrb- . like few here , when I set the modem up , it would keep resete itself in 2-4 minute . when modem be only connect to the cable , it be look good , all light be on , but as soon as I connect the computer either directly or through the router , the connection would not last long , light would turn off and connection procedure would restart , then they would stay on for few minute and whole cycle would repeat . I be unable to finish the self registration because the modem would restart itself around the same time I submit the first screen , on few occasion I get through to the 2nd or once even 3rd screen . I have try with two laptop either directly or via modem but to no awail . after read review from similarly affect people here and elsewhere on the web , even though it may well be just the one instance I get , I have decide to return the modem completely and not ask for the replacement . instead , I have order the same modem I be rent from Comcast and have no problem with : `` ubee ddm3513 Docsis 3.0 Cable Modem '' . it should arrive today so I be really curious if I make the right choice . I wish Comcast have some kind of ` lease to buy ' program or option to purchase the equipment you be rent . UPDATE : ubee dm3513 modem work like charm right out of the box , with self registration I be up and run in about 10 minute .