Xbox one, one s, one x slow upload issue “HELP”

I would check your equipment again. I do not see a lot of noise out there on this and I think there would be considering the number of Cox users that are Xbox Live each day. Also, if you are getting the 3Mb/s then disconnects and lag should not be happening.
You need less than 1Mb to on the upload side to game. I get the streaming thing but the disconnects and lag do not makes sense with a low ping and at least 0.5 - 1Mb of upload.

I was using cox equipment, Arris. I went out a couple of weeks ago and bought a netgear ac1750. Still no upload improvement. 1.7mb/s upload where it should be 30mb/s upload. Dmz setup no change, even turning off my firewall and testing also changed nothing.
Cox insists its not on their end. They state that microsoft did and update october 11, 2018.

Unfortunately it seems to be an issue with your ISP and as such there is nothing Microsoft can do. I would apeak to your landlady and see if she would agree to let you go to another ISP. You might want to auggest that you would pay for any installation
costs because that is probably her worry. If you pay all costs I don't know why she would care who your ISP is.

If a console is wireless it wont have the full internet speeds compared to it being wired.

As you said you tried it on another ISP and you getting the full speeds thenbit is certaimly from cox side that has the issue.

You will need to contact official support about this. If you tried all those steps, there must be another issue. https://support.xbox.com/en-us