Upload speed constantly dropping to nothing

Thanks for the response. My mode is the basic Arris TM3402A that they provide to users that have phone service and internet. I have actually filed two FCC complaints over the last few years of dealing with this. The first time they basically said "We don't see any issues so there is nothing we can do but you can pay for a faster internet package if you would like"  The next time they replaced the line coming into my house and the line buried underground and when I still had the issue they blamed my Ethernet cables so I replaced those. Then they blamed my router so I wired my computer directly to the modem and when I still had issues they just tried to sell my on a faster internet package. They have put attenuators on there but each person they sent out changed what the previous person did to see if that would fix it.

Edit:I just looked through some old screenshots and the last thing they tried was adding a FAM3 3db attenuator thing but that didn't seem to fix it so it was removed. I didn't take pictures of the two other devices they tried unfortunate. 

TM3402 is DOCSIS 3.1.

looking at the logs on up link it showing Docsis2.0 so it could be something at the pedestal or where the main cable comes into your neighborhood i personally have cox fiber now but i used to have coaxal cable i had to put in a fcc complaint and techs from cox corporate had to come out because contracters are worthless and cause more issues so i would file a fcc complaint .

Is there any way to get them to check more than my property for possible issues? They usually just show up and look at the cables / modem here then they just swap the modem out once they see that all the wiring here has been replaced. One month they swapped my modem out like 4 times and that was it. When I told the tech that showed up that they had already swapped my modem out multiple times he kind of sat there for a second before deciding to swap it out again anyway. When I try to explain the issue I am having I think they think I am complaining about not having fast enough upload speed for what I am trying to do so they try to convince me to buy a faster internet package but I am really complaining about my upload speed dropping to 0.05 or worse with crazy high packet loss and occasional modem reboots. 

There was one time the tech said my upstream signal looked bad but he wasn't 100% sure what to do so he called a superior and I hear the guy on the phone tell him to just say its a downside of the internet package we have and to upgrade. The guy didn't know he was on speaker phone and that I heard all of that so I was hoping that awkward interaction would get something done but it's always the same thing. They will say they don't see any issues then give me another modem over and over even though multiple people have told me that my upstream signal seems a bit bad/weak.

Hi mmmm,

I'd like to review your previous service calls and help determine the next best step in getting this resolved for you. So we can assist further, please email us at cox.help@cox.com. Please include a link to this post. You can also message us on Facebook or Twitter.

Thank you.