Issue with X1 Cloud DVR (AR AX014ANM) Cable Box

I have been having intermittent issues with pixelation and tiling when watching TV using my X1 Cloud DVR (AR AX014ANM) Cable Box.  Internet and streaming are perfect, but cable tv pixelates intermittently.  Comcast Techs have replaced the coax cable coming into my house from the main comcast line in the alley.  All cables and connectors going into the X1 box and TV have been replaced with brand new cables/connectors, so I can only conclude it is either 1) The X1 cable box itself or 2) The cable service coming from the main Comcast Xfinity service line (Can the main service line also be checked by Xfinity possibly?).

How can I have Xfinity send me a new box so I can swap my X1 Cloud DVR (AR AX014ANM) Cable Box to rule out that as an issue?  I am unable to get to a Comcast Xfinity store in person.  All of the self service leads you to either add or remove/return a box as a service, and I haven't had any luck getting a tech to provide me with a new box as a troubleshooting method.

Thanks!!