Looks like the firmware on my SB8200 was malfunctioning (long story, but trust me on this). Mediacom tech support told me to request Arris to update my firmware.
According to what I’ve read in this Community, it seems like Mediacom should push any/all firmware updates to my SB8200.
Related info: hardware reset in my SB8200 cleared up my issues. So the firmware probably was trashed.
Going forward, I would appreciate some informed input from y’all before I start getting after Mediacom.
Thank you, Dave