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CAX30 Poor Downstream Connection / Partial help
I've had this CAX30 router/modem for about 10-11months. Pro installed by Cox (1gig) I had issues with stability in the past, but it seemed fine for months and now all of a suden back to stability...
Being in a rental situation, there are limits as to what you can access and check. Are you in a single family unit or do you have some close neighbors that could be experiencing the same issues?
You still pay Cox a monthly fee to deliver a service. A lot of things can change/deteriorate in a year that are the responsibility of Cox and you are the only one being affected. It is not unusual to have to push a service provider to deliver reliable consistent service. If you do not push, no one else will and they are happy to collect the monthly fee and go on down the road.
Here is a link to some details that might help you. Clearly some do not apply. Look for the details that may resolve your issue.
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
Agree with plemans, your power levels are still a long way out of specification.
Just took a second look at your latest cable data. It appears Cox has enabled mid-split in your area. I can see your OFDM channel 2 is running at 918 MHz and the power level is way below specification. There is a good chance Cox did that in the past year.
Whether you only use one connection or not, there could be a splitter in your coax connection. Many old splitters are rated for 5-860 MHz and cause a significant signal loss above that frequency range. The splitter needs to be replaced.