Dejavu - cax80 and xfinity

[ScottF2112]

Same for me with a new modem yesterday.  I was getting 800 down with an older, no longer supported modem..  I see several posts about and this and not a single resolution.   Does this modem just not work and the only answer from support is something like "you don't know how to run a speed test" ?  

[FURRYe38]

What Firmware version is currently loaded?

Please post a copy and paste of the modems connection status page.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
Be sure your using good quality RG6 coax cable up to the modem. 
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router?article=24311
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html