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Wednesday, April 16th, 2025 3:04 AM

Packet Loss on a New XB8-T +install

I signed up for 800 mbps service last week and the tech came out to install the modem. Even though they are seeing 800+, when I do a speed test on a PC as the only connection to the modem, I get speeds of 360 max. I am using PingPlotter to look for packet loss and I'm seeing tons of it. AT the modem and at various hops along the way. Here's a typical report.

When I call the Xfinity "help" line, the support people don't know what Packet Loss is. Their solutions are for me to upgrade my service, or to just go away. I've been having buffering and glitches with all streaming services, even podcasts for several weeks. My initial contact about this was last week and his solution was to upgrade my service, so here I am, a week later with the same issue. How do I get this fixed? Mike

Official Employee

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2.1K Messages

9 days ago

 

user_0ejd3b

Thank you for reaching out. I hope you are doing well today, despite the issues with the network. I understand that at the time of the installation, the tech captured full speeds, but you have yet to see this on your end. Additionally, you've seen gradual packet loss affecting videos, streams, and podcasts. I'm sure this has been frustrating. I appreciate you bringing this to our attention and creating a new post. 

I did check the levels at home, and I did see the upstream RX power wasn't up to par, but I didn't see any other red flags yet. Are you able to provide a screenshot of your most recent speed to gateway test? 

 

7 Messages

@XfinityVianney​   302Mbps is about as fast as I've seen. It's usually in the sub-150 range.

I need to reduce the reduce the resolution to 720p to be able to watch a Netflix movie. Not good.




(edited)

7 Messages

fyi these were done with everythinng freshly power-cycled.

Official Employee

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1.2K Messages

@user_0ejd3b thank you for the additional screenshots and information. When you are experiencing the buffering when streaming or listening to podcasts, are those all the same device? 

From experience, I had an older laptop that had speed/connection issues. Got a new laptop at the beginning of the year, and have seen a huge improvement. 

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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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7 Messages

1 day ago

I have tried connecting a high-end i9 windows PC to the modem, with this being to only connection. There is no improvement. I suspect that the issue is with the Comcast servers.

Official Employee

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1.2K Messages

@user_0ejd3b appreciate the update of the device your testing on, just wanted to rule that out as possibility. I'd definitely like to investigate further and want to ensure the modem is provisioned correctly, or if I can see any signal issues coming into the home from the area equipment. 

Since I will need to gather information to locate your account that we don't want here in our public conversation. When you have time, please send a direct message. 

To send a direct message: 

 

Click "Sign In" if necessary

 

• Click the "Direct Message" icon in the upper right - it looks like a chat bubble  

• Click the "New message" (pencil and paper) icon just to the right of Conversations

• Type "Xfinity Support" in the "To:" line - do not use the Employee's name!

• Type your message in the text area near the bottom of the window

• Press Enter to send it

To expedite your request, we ask that you please include your name, the account holder name (if different), and the service address

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
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We ask that you post publicly so people with similar questions may benefit from the conversation.
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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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7 Messages

have also connected the tv as the only device connected to the modem and I still get massive data droputs. I have to adjust Netflix to 720p in order to see anything on my 4k tv. There is an Error Message box on my LG tv that reports lack and resumption of ethernet data, and this thing goes on and off every 4-5 minutes, even with nothing streaming.

Official Employee

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1.2K Messages

@user_0ejd3b that's helpful to know as well. And based on the 800 MBPS speed you said you should be on, it shouldn't need to have the resolution speed lowered as it should be able to support higher resolution video. 

It looks like our communications may have crossed paths when posting. Once you're able to see my previous reply about the direct message, please follow with the requested info, and I'll be able to start troubleshooting. 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

7 Messages

I normally only use one steaming device at at a time, either our living room TV, or a music streaming device (Alexa), or a PC running Youtube, but practically never simultaneously.

Official Employee

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1.2K Messages

@user_0ejd3b the 800 MBPS download can support up to 11 devices at a time, so can definitely handle the number you would be running at a time based on you saying you're typically only running 1. 

I'll watch for the DM to be sent, when you have time. 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick
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