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I have Gigablast service that is now suddenly topping out at 300mbps DL and 5mbps UL. Up until last week I had full 1000mbps speed DL and 40mbps UL. My modem is a Motorola MB8600. Its obvious that COX has changed their system in some way within the last week or so and caused this issue.
I had a COX tech come out who determined that my modem is the issue and most likely needs a firmware update but that they wont update it since its customer provided!
I contacted Motorola who told me that they do have a firmware update to my MB8600 which they have forwarded to COX to provide to their customers. They said that ALL updates should be provided by COX. They said they specifically created this firmware after COX system updates have created intermittent connectivity issues and degraded speeds to many Motorola users modems.
Motorola said they will contact COX to tell them they should be pushing this update to me. We will see what happens....
Oh, and as a cherry on top, it looks like COX will be charging me $75 for the service visit since the problem was a "customer equipment issue".
Actually it wasn't the tech who said this. It was the support center office who he was on the phone with the entire time. I asked to speak directly to the phone tech because I didn't believe it either. The onsite tech reluctantly allowed me to speak to him and the home office tech specifically stated that customer bought modems will not be updated by COX and its up to the customer to update their firmware. As far as I know that's not even possible and I thought it was pretty crappy considering it was COX's system updates that screwed up my Gigablast speeds!
Hopefully Motorola will talk some sense into COX engineering and they will push the update to my modem and that will fix my recent slow speeds. I am also currently on the older Software Version 8600-184.108.40.206
All I know is that if this truly is COX's official policy to screw anyone not using their equipment then I think I will finally have to leave them for someone else after being with them for 20 years when they were @Home!!
OpenBSD have you done a recent speedtest? I'm curious to see if your speeds have degraded like mine have.
Brian, thank you for your response. I checked this morning and you are correct. The update has been pushed to my modem sometime in the last 24 hours as I now see I am on 8600-18.2.9 Unfortunately, my speedcheck still indicates that I am topping at 300mbps despite being on the Gigablast plan. The mb8600 is a COX certified modem according to your website. Is there some sort of configuration issue on your end that would be limiting me to this speed? My speedtest corresponds to the speeds I was receiving prior to upgrading to GIgablast 1 year ago which makes me think something has changed on COX's end. One week ago I did not have this issue.
I can confirm that I am having this same issue, also on an MB8600. Speeds are topping out between 300-350 Mbps whereas before I would be able to get to a little bit above 900 Mbps. However, I am still on the 8600-220.127.116.11 software version (though based on your previous comment, it doesn't seem to make a difference).
As a side note, I noticed that even when things were fine, enabling IPv6 in my router would degrade top speeds (down to the 300s, I think it was?), whereas going with strictly IPv4 would result in normal tests ranging between 700-900.