Severe packet loss and connection drops every night

Happened again last night for 3 hours. Any information or advice would be greatly appreciated.

Exact same problem here. I know it's not with my home network, but Comcast refuses to do anything about it. I was told its "noise" on the network.

Could it be a modem issue? My modem is 8x4 which is pretty outdated. If I get a modem with more downstream channels could it help?

Any insight is appreciated, thank you.

Start here;

https://forums.xfinity.com/t5/Your-Home-Network/Connection-Troubleshooting-Tips/m-p/1253575#M94474

Post the requested info from here;

https://forums.xfinity.com/t5/Your-Home-Network/Information-Requested-for-Connection-Related-Posts/m-p/1253381#M192739

This is still occurring every night.

Further research has pointed to either:

-someone in the neighborhood generating a lot of noise on the network

-an old/outdated modem (8x4), which I will upgrade this week but not sure if it will do anything

ANY information is greatly appreciated. Troubleshooting tips/general advice on how to reach out to Comcast effectively, etc

The signal stats are o/k but the error log entries indicate 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 will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic. Good luck !

Modem’s error logs - https://imgur.com/a/CAAdUra

Make and model of modem - TP LINK TP-7610

Make and model of router - ASUS RT-AC68U

Let us know if you contacted Comcast or had a tech visit - Yes, 3 techs have checked my hardware/wiring and neighborhood tap, they said everything was working fine. The issue is, they can never detect the issue as it occurs starting at night. I was told from the local supervisor that the networking team was monitoring my connection but nothing came of that.

Let us know what the lights on your modem are doing when you are having problems - Nothing out of the ordinary.

Screenshot of signal levels - https://imgur.com/a/pgTuqlp

Let us know to what speed tier you subscribe - 200MB/s down

Unsure of what to do at this point. I've tried reaching out to Comcast over a dozen times, and the furthest I've gotten was being told by the local supervisor that the networking team would monitor my connection and those of my neighbors. Nothing came of that, and since then the supervisor has been ignoring my voicemails about the issue. I'm fairly certain it is not a hardware/wiring issue on my end as my connection was perfectly fine just 4 months ago until issues started happening. It seems to be either an overcongested line or someone in the neighborhood causing noise/feedback on the line.

Hi AZhang. Thank you for visiting and posting on our Forum. Apologies you are experiencing continued issues with your internet service. I can assist in reviewing your connection issues. I'd like to start with polling the CMTS for real-time and historical RF signal reports from your modem. I can also check your local Node/Plant for any degradation or error reports. Please send me a private message and include your full name so I can access your equipment. 

The packet loss started about 10 minutes ago, here's what a brief traceroute looks like at the moment: https://imgur.com/a/oNvuSVb

Modem stats at the moment: https://imgur.com/a/T9G6LdF

I am considering upgrading to a modem with more down/upstream channels tomorrow, unsure if it will do anything.

I would greatly appreciate any sort of updates on this issue. At this point all I want to know if it's an issue on my end or something outside of my control for a better idea at how to approach fixing it.

Hi AZhang. Apologies for the delay. I did receive and respond to your private message. Let's continue our conversation via PM please. Thank you. 

Packet loss started at 6PM today, 2 hours earlier than it's ever been. Getting high amount of T3 timeouts as always.

I am wondering how to reach someone at Comcast who could investigate ingress noise or upstream SNR issues, or at least give a definitive answer as to what's happening.

I've upgraded my modem and it seems to help slightly, but the same thing is happening at the same time every night. Now instead of 15-30% packet loss i'm getting around 10-20% which is still quite terrible for anything requiring a stable connection.

At this point I'm 100% certain it isn't my hardware, signs point to ingress noise on my tap or upstream SNR issues. I'm not the only one getting the issue as well, my neighbors are experiencing the same thing.

How can I go about asking Comcast to investigate, besides scheduling another tech and hope they can help?

A tech came yesterday and said the same as every other tech - signals/wiring was fine since it was during the day when the issues aren't happening. He made a networking ticket which was marked as resolved the same day, and of course at night the packet loss happened again. This time much worse and closer to the loss I was getting before my modem upgrade (20-30% PL).

At this point I'm at a loss for how to fix this issue, everything seems to be a dead end.