All tests were the same with ~30Mbps download and 35Mbps upload. With the tech on the phone, I tested with my router connected to the modem, then directly to my PC again, and back to my laptop directly. When I logged into the modem directly, the Power/SNR values all looked nearly exactly the same as my original modem (in spec). The technician on the phone said everything looked good on his end and he was at a loss, he forced provisioning/resets a few times and could see nothing wrong. This was with my laptop directly wired to the new SB8200 modem, bypassing my router. I tested again and as I expected, same problem, download speeds of only ~30Mbps. After a bunch of waiting, the modem rebooting, and provisioning seemingly many times, it got all setup and connected. I called Cox support again and got a technician on the phone to register my new modem. So, I went to Best Buy and bought a brand new Arris SB8200 modem. Oh, I was told to get a new modem again and they assured me it would fix my problem (despite them saying everything looked fine on their end). Again, went through all the same troubleshooting, only to be told they cannot send a tech out unless my service was completely down. I called support on the phone, hoping to get a technician dispatched. To which they responded "wow, you need a new modem!".At that point I was tired of chatting with support. When they asked how old my modem was, I told them ~3 years old. We went through the same old troubleshooting that I had done countless times up to this point. The upload speed DID update to 35Mbps upload, from 10Mbps, after yet another modem power cycle. Not a huge deal.except when I tested the speeds again, my download speed was still ~30Mbps. While in that chat, I received a text and email that my service upgrade was confirmed, so I guess I now have 1Gig download and 35Mbps upload, even though I declined it. I got another chat agent online and began the process again. He reset my modem one more time to test and I got disconnected from the chat. I declined the upgrade package as I wanted to get my problem fixed first. He insisted my modem was bad, that I should buy a new one, and he would upgrade me to the latest internet package of 1Gig down, 35Mbps upload (for just a couple extra bucks a month). I could see no such packet loss doing my own tests. One agent said my modem was bad because he saw 30% packet loss to the modem from his side, but otherwise it showed healthy on his end. Same results, ~30Mbps download, 10Mbps upload, whether connected through my router or direct to the modem. Power cycles, remote resets, health check on their end, etc. I spoke with live support chat a few times, each time going through the same old rigamarole that I had already done. I logged into my Arris modem directly and the Power and SNR values were all within manufacturer spec, everything was OK and Online, it looked healthy. I also directly connected both a laptop, and a wired PC, to the Arris modem via ethernet (bypassing my router) and experienced the same slow ~30Mbps download speeds with both devices. Several Windows PC's, laptops, mobile devices, Linux server, IoT, etcīefore involving Cox support, I power cycled the modem and router half a dozen times with no changes in download speed. Arris SB8200 bridge mode (self purchased, not a rental) Before I left town I had no issues with download speeds, although the last test I have in my Speedtest log was from and it was 476Mbps down. Speeds were the same whether it was wifi or direct ethernet to my router. My service (at the moment) was 500Mbps down and 10Mbps up. Speedtest consistently showed ~30Mbps download and 10Mbps upload. I returned from a 1.5 week vacation yesterday to extremely slow download speeds. Slow speeds are consistently reproduceable. Max speed wasseen in a few tests, but not reproduceable. Cox technicians have no idea what the problem is as everything looks healthy. Extensive testing and swapping modems, routers, PC/laptops, does not point to any single failure point. TLDR: Download speeds suddenly and unexpectedly dropped significantly below what my service is rated for. I do have a Cox technician coming to my house tomorrow to check the physical/wiring/cabling side of things outside my house. I am experienced with networking, routers, modems, systems, and troubleshooting, but running out of ideas. I work from home and need my internet working fully to do my job. This is an incredibly frustrating problem that I've spent just about all day and yesterday evening troubleshooting, so it is very long (sorry). Location is Scottsdale, AZ 85254 if it matters.
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