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user_1noqq9
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Tuesday, June 23rd, 2026 12:43 AM

Internet Quailty Issues (Uncorrectable Codewords On OFDM)

Hi, I'm experiencing persistent random bursts of packet loss and I've already done a fair amount of troubleshooting on my end. My Modem is a Hitron CODA56.

What I've tried:

  • Tightened all my coax connectors
  • Tried removing all in-home splitters and running the modem on the entry Coax through a MoCA POE filter. Counterintuitively, the packet loss got considerably worse so I went back to running through the splitter. 

From what I can see on my modem stats page is the high-frequency DOCSIS 3.1 channels are racking up hundreds of millions of uncorrectable errors.

Can someone take a look and/or get a tech dispatched to check the drop and tap? Thanks in advance!

Modem Stats with coax through splitter:

Modem stats with no splitter in coax path:

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3 hours ago

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XfinityLinda

Official Employee

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2.5K Messages

3 hours ago

Thanks for providing those details and for the troubleshooting you've already completed to us here in our community, @user_1noqq9. Given the packet loss you're experiencing, the uncorrectable DOCSIS 3.1 errors, and the results of your splitter testing, we'd like to take a closer look from our side. Please send us a Direct Message with your full name and complete address, so we can review the signal levels and determine whether a technician visit is needed. Thanks!
 

1. Click "Sign In" if necessary.

2. Click the "Direct Messaging" icon.

3. Click the "Start new conversation" (pencil and paper) icon. 

4. In the "To:" line, type "Xfinity Support".

5. As you type, a drop-down list will appear. Select "Xfinity Support" from that list.

6. A "Xfinity Support" graphic will replace the "To:" line.

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

8. Press Enter to send it.

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