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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...
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.
Kitsap is correct. Your power levels are all over the place and out of spec big time.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
If you can, simply connect the modem right where the coax comes into the home. This prevents wiring in the home from being the issue. And some ISP’s charge if the wiring issue is in the home. So this helps prevent this.