Nighthawk CM1150V

I’ve had intermittent internet issues - Xfinity techs to house twice, router replaced by manufacturer and new modem replacement on way as well. In addition, I occasionally have pixelation on at least one TV. Netgear has said the upstream channels on modem should all be locked, and I have some unlocked and say Xfinity needs to make these adjust to their modem provisioning. I called Xfinity and nobody I spoke with now anything about this. Netgear sending new modem, should be here today - I’ll see what happens and update.