CM1200 Random disconnects, plenty of uncorrectables as well

@user_79617b 

Please redact all of the CM MAC and the CMTS MAC addresses from your error log entries for your privacy. They are considered to be personal information. The posting of personally identifiable information is a violation of their forum guidelines. The forum bot will not allow your post to be seen publically. It flagged your post as "Private". 

That said. The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In an effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1000 MHz, bi-directional, and no gold colored garbage from Home Depot, Target, Wal-Mart, etc. Splitters should be swapped with known to be good / new ones to test.

Also check the coax cable for any damage such as cuts, nicks, abrasions, kinks, sharp bends, etc.

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two-way splitter connected directly off of the drop from the street / pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

My pleasure ! Good luck with this ! Please post back here with how things turn out.

Hello, @user_79617b. Thank you for reaching out over Xfinity Forums, you have reached out to the right place for assistance. I appreciate all the detailed information you have provided, and completely understand where you're coming from in regard to needing a solid internet connection as I work from home as well. 

I would like to ensure that you're able to get this corrected, and see you were working with someone over the phone. If you're still needing help, please send a DM with the requested information as we don't want that in a public conversation: 

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.