Same kind of problem in 92691. Lots of correctables/uncorrectables on cable modem, although data rates are decent (usually 100Mb/s for the "150" plan). Most annoying are the dropped connections which kill the VPN for work, and kill online gaming (kids go crazy because a dropped connection looks like you quit a match, and you get banned from the game for a period of time!) Checked connections as best I could. Emailed email@example.com just now.
Cox replied to my support email very quickly with a suggestion. Have not been able to try yet since it involves connecting computer directly to cable modem (which means no router, so no internet for anyone else!)
Cox techs came by the house and found that a neighbor's cable was introducing some noise into ours, so they added a filter to their cable and mine may have improved somewhat. I still get long pauses on my work VPN indicating a possible timeout, but I do not seem to be dropping the connection as much.
Connection speed still varies from 70 - 130Mb/s, but connection stability is more important. You can still stream HD at lower data rates (70Mb/s is more than enough for several devices), but if you drop the connection you will definitely notice and be frustrated. Same for gaming: an immediate response (ping) is more important than data rates - you can have all the bandwidth you want but if your ping is slow you can not game.
I am not convinced my problem is gone, but maybe yours is the same - you could ask Cox to visit the house and check for noise on the connections. They can not come inside your house to measure signal levels though.
I did have a tech scheduled to come to the house originally. The tech looked at our node remotely, determined it was over saturated, told us there was nothing they would be able to do, and canceled our service call.
In the end, it appears more like Cox' infrastructure simply is not properly capable of handling the existing demand given this scenario. Scoping and planning for disaster recovery scenarios is done as standard practice in the tech industry, it just feels as if Cox may have not planned appropriately. Either way, we're getting nowhere near the service we are "suggested" to get and it stings even more because we "pay" for the unlimited download caps...
Well, I had another bad day today dropping the connection many times, so I think the Cox tech visit did not really help after all. When he was here, I asked the service guy and he said he thinks they are at 90% capacity in our area, but I tend to agree with you: they are at 110% like airlines overbooking! And my problems really started when we began working from home, so it figures. Good luck with your case!
I'm also in 92691. Same issues, though thankfully we never lose connection. But the jitter is so bad (ie ping is so inconsistent) that voice/video calls are garbled and the kids games are a mess. But it's not consistent. We get smoooooooth connections for hours at a time, and then its garbage for a few hours.