You need to isolate the problem. Is the problem poor wifi connection, ourloaded ourter, bad QOS due to router not prioritizing traffic properly, devices wasting bandwidth, or a problem with your internet itself?
This really sounds like something "outside my paygrade" Seriously, should am ISP require it's users to get so deep into the weeds to address internet WiFi speeds?
Wifi connection can easily be checked, just check if the slowdowns correspond to connection problems.
Connection problems? If this is a router issue, and Cox just gave me a new modum/router combo unit and it's powered up and my WiFi analyzer app says I have to strong signal, on multiple channels, it that r/o a connection problem?
Overloaded router - during a slowdown try disconnecting 2-3 users that ARE NOT USING SIGNIFICANT BANDWIDTHand see if anything improves.
When you say "users" do you mean people or devices? I live alone, so there is no one in the house using my devices, except me. When I turn off my tablets are they still using bandwidth? When my desktop is off, is it still using bandwidth? As far as I know, the only things accessing bandwidth is my thermostat and my security camera...and the plugs the control power to my laptop, tablets, and lights. Do plugs use a lot of bandwidth?
QOS should have some settings in your router, check what options are available
What is QOA
Devices wasting bandwidth - this is a big one and likely culprit with a large home network, and will take effort to track down. When you get slowdowns, try disconnecting devices to see if it solves the problem. If it is a certain device causing the problem, change some settings on it (e.g. if it's a camera uploading footage to the cloud, maybe decrease the resolution, or change to local storage). Keep in mind phones will be busy backing things up, downloading updates constantly. TVs will be streaming stuff. Computers will be downloading things, cameras uploading things etc etc.
My security camera may be the culprit but it's also a high priority device because is surveys an area where there has been some illegal activity recently. Should I be concerned about plugs?
Internet itself, unlikely culprit, but possible- when you're experiencing a slowdown, disconnect all wifi entirely and plug straight into the router. Check speedtest.net or similar and see if your internet speeds are close to what you should be getting
No, on my desktop, which is connected to the ethernet I have good speeds. I can't
I would prefer not to be forced to spend $2-$4 hundred on a stand-alone router but I'm beginning to wonder if that wouldn't be the simplest solution, as getting into the weeds with the Cox combo, which appears to not be takes, would be easier than constantly have to deal with slowdowns. But would that solve this apparent bandwidth issue?
Bottom line, it seems to me that Cox should be more helpful in resolving this issue. I still don't understand why the speeds come up after they visit then drop down again a few weeks later. This has happed TWICE before.