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OsoRexx
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Sunday, November 23rd, 2025 8:11 AM

XB10 Internet Speed Issues

I cant find a solution to this problem ANYWHERE, and the customer service reps on the phone and in store seem to have no solution whatsoever. 

To make it as simple as possible, I switched to the XB10 today after having the XB8 for many months. My Download/Upload Speed were at a constant 2300mbps/360mbps with the XB8.

I have been paying for the 2GB Sequential on X Class plan for quite a few months now, so I have the correct plan.  I test speeds from my PC with a 5GB Ethernet port on the motherboard using a CAT8 cable. So all my hardware and X class plan meets requirements.

After setting up my XB10 today, Ive had constant issues and fluctuations with my Download/Upload speeds. Download speeds on the XB10 have been ranging from as low as 600mbps, to 2000mbps. My upload speeds on the XB10 have been as low as 12mbps, to a high of 300mbps. Constant changes after every test even a few minutes apart, and even on the Xfinity app connection test it says im not longer reaching 100% of my plans speeds when it use to exceed 100% with the XB8.

I have tried many times to reset my modem and nothing has changed, I have extremely lower Download/Upload speeds after switching to the XB10 when my speeds on the XB8 were always consistent. This has been a headache and im hoping someone can help me find a solution.

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17 hours ago

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XfinityBillie

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3.8K Messages

2 months ago

Good morning and happy Sunday OsoRexx! I'm sorry to hear that you aren't getting the correct speeds after upgrading your modem. Just to clarify, are you using a stand-alone router along with the XB10 or any network switches? You mentioned that you've run a speed test from the app, have you also performed any troubleshooting in the app or checked that the connections are secure?

 

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OsoRexx

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3 Messages

Hi, no I’m only using the XB10 alone.

no routers or network switches. I have tried almost every trouble shooting option possible through the app. I have reset the XB10 through the app multiple times, tried resetting from the reset button on the back, tried removing the power cord for 30 seconds, still the problem persists. I’ve tried checking for loose cables, I’ve unplugged everything from the phone line to switching Ethernet ports, removing and putting the coax cable back on and making sure it’s secured but not over tightened. Still nothing. 

I also want to add that some may suspect outside cable or connections may be damaged or incapable of running these speeds. But, I was getting great speeds with the XB8 modem in the same day. I was getting 2300+ mbps Download speed / 360mbps Upload speed with the XB8. Just a hour or 2 later, plugged in the XB10 after swapping it out at the store and speeds are significantly lower. 

(edited)

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2 months ago

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XfinityBillie

Official Employee

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3.8K Messages

 

OsoRexx I really appreciate your due dilligence on troubleshooting. I'd like to get a look at the signals and run some additional troubleshooting steps on our end. Please send us a DM to Xfinity Support with your full name and address to get started.

To send a direct message:
Click "Sign In" if necessary
Click the "Direct Message" icon or  https://forums.xfinity.com/direct-messaging
Click the "New message" (pen and paper) icon
The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there.
As you are typing a drop-down list appears. Select "Xfinity Support" from that list.
A "Xfinity Support" graphic replaces the "To:" line.
Type your message in the text area near the bottom of the window   
Press Enter to send it

 

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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2 months ago

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OsoRexx

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3 Messages

Okay I just sent it.

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2 months ago

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user_zcm143

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3 Messages

@OsoRexx did they help? I'm experiencing the exact same issues.

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1 month ago

user_097at4

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2 Messages

I'm having the same issue 

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1 month ago

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user_097at4

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2 Messages

1 month ago

Please let me know if they fixed it. I have the same issue at the moment 

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XfinityVictor

Official Employee

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1.9K Messages

 

user_097at4 Hello, I am really sorry you are experiencing service issues. I understand how frustrating it is, and I am happy to help you troubleshoot your service. First I will ask a few questions to better understand the root of the problem. We value you as a loyal customer and would like to resolve this issue, so you can enjoy our great service.  To avoid repeating any steps you may have already taken, can you please describe what you have done to resolve your service issue? 

 

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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1 month ago

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jeremiemech

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3 Messages

1 month ago

same issues same speed same equipment. whats happening?

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XfinityEricB

Official Employee

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3K Messages

 

jeremiemech Thanks for reaching out to us for help with the speed issue on your XB10 using our X Class service. I would be happy to assist with getting this fixed for you. 

Can you send us a direct message with your full name, name of account holder (if different), and service address please?

To send a "Direct Message" to Xfinity Support:

Click "Sign In" If necessary

Click the "Direct Messaging" icon (speech bubble)

Click the "New message" (pencil and paper) icon

The "To:" line prompts you to "Type the name of a person".

Instead, type "Xfinity Support" there

As you are typing a drop-down list appears. Select "Xfinity Support" from that list

An "Xfinity Support" graphic replaces the "To:" line

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

Press Enter to send it

 

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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1 month ago

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user_709qxn

Visitor

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3 Messages

26 days ago

I'm also having the same issue.  On the xb10 internet consistently drops but never did with the xb8...

There's a huge hardware problem with the xb10. I'm going to go swap back to the 8. 

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jeremiemech

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3 Messages

would you still keep the same speed?

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26 days ago

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user_709qxn

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3 Messages

It seems I still have the exact same speed.  Maybe upload is slightly lower.   But you would only see that lower upload during a speed test  otherwise you'd never notice. 

I already swapped back to the xb8 and had 0 dropped Internet and issues.   They need to discontinue the xb10 until the hardware issue can be resolved. 

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20 days ago

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user_sdoui8

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2 Messages

22 days ago

I also have the same issue

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user_zcm143

Visitor

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3 Messages

18 hours ago

I had a filter on the line, which is not compatible with the xb10; it was a moca filter. And the solved some connectivity issues but I still had issues. So I got tired of the issues and I just bridged the xb10. 

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user_zcm143

Visitor

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3 Messages

18 hours ago

And apparently, moca filters are required for everything, including the xb8. Remove the filter and try the xb10.

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user_sdoui8

Visitor

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2 Messages

17 hours ago

There were two issues.

First, the node outside my house was missing some signals. This was escalated to a different technician to fix and wasn’t related to my equipment, so the visit fee was waived.

Second, there was a splitter. The XB10 is very sensitive to certain splitters, so we reworked the setup: the outside cable now connects directly to the XB10, the XB10 connects to my MoCA adapter, and the MoCA adapter connects to the other side of the split coax. This effectively dedicates my house to the MoCA network, and I’m now getting symmetrical download and upload speeds.

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