Still having the issue so I referred to the docs and posted below
Modem Error Logs:Make and Model of Mode: Netgear CM400
Make and Model of Router: tp-link TL-WR940N
My speed tier is Performance Plus
Download Speed: 60Mbps
Upload Spped: 5Mpbs
I have not contacted Comcast or had a tech visit me.
My lights on my modem are all green
While directly connected to the modem:
Can't see your pics. Since you are a new poster, they need to be approved by a Forum Admin. That could take some time. In the interim, you could try hosting them at one of those free third-party pic hosting sites like Imgur or Photobucket and post the link to them here.
I believe you should be able to see them now, also it seems like my comment is not linked but the original post in reference was for https://forums.xfinity.com/t5/Your-Home-Network/Speed-always-drops-to-2Mbps-from-100Mbps-within-15mi...
The signal stats are o/k. Is this with a WiFi connection ? If so, for a test, does a computer hardwired directly to the TL-WR940N router with an ethernet cable have the same problem ?
I haven't tried the test when it was pluged to the router but the above speed test happend when I was directly plugged to the modem. Hence, I am thinking that it's originating from the modem or past.
O/k good. That was going to be my next suggestion and it's the ultimate test that points to an issue between you and the Comcast system / WAN and not an issue on your LAN.
Even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is noise ingress into the line(s) somewhere.
There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.
I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.
You should get a reply here in your topic. Good luck !
Greetings, @chocolateMoose! I appreciate you taking the time to reach out to us here on the forums. I hope you are having an amazing day. I apologize to hear you are running into issues with your internet dropping to low speeds. That's certainly frustrating. I would like to see what could be going on. Can you please send me a PM with your first and last name so I may further assist you?
To send a private message, please click my name "ComcastMichael" then select "Send a Message" on the right side.