this modem be purchase because I want to stop rent a modem from my provider . however , in try to install this modem , it would switch back and forth between be connect and not be connect . furthermore , my provider 's technician inform I he be be see many problem with this model and recommend I the sb6120 -lrb- the older model -rrb- instead . I definitely trust he judgement over mine in this particular instance and will return this and purchase that one .