What's the newest Arris Modem that will last the longest for COX?

Correct my WiFi stopped working last night, and customer service said it's outdated and said I need a new modem.   I purchased it in 2019.     Then tried telling me I can rent a panorama modem for 15$ a month.    I said no thank you. 

https://www.cox.com/residential/support/cox-certified-cable-modems.html

according to this on the COX WEBSITE, the SB8200 & the S33v1 is not supported anymore 

When I go to that website I see the S33 as supported and approved for the 2Gbps service plan. I also see the SB8200 as supported for 1Gbps.  What am I missing? Can you show a screenshot? Are you mistaking the Wifi Yes/No for not being supported?

The 8200 has nothing to do with WiFi. It provides internet to the router that THEN provides WiFi but the 8200 is a modem only. If you are having issues with WiFi then look at your router. 

So you suggest just renting equipment until 4.0 comes out?

Perhaps, but I wouldn't be surprised to see newer/better DOCSIS 4.0 modems come out on a regular basis.  Every few months or so a newer and more capable devices will typically become available.  If you look back at DOCSIS 3.0 for example, the 1st modems were 4x4, then 4x8, 4x16, 8x24, 8x32.

There's nothing wrong with using an SB8200 but at you stated it's 4 years old now so plenty of newer devices have since hit the market.