Large number of uncorrectables

@BruceW  thanks for the response. As I said in the first post, Arris sb8200 modem, 1200 mbps service. I never asked for the 1200 mbps service. Like I also said, this connection has been rock solid for years, no errors. I am going to try the other modem when it arrives today. I will also take a look at the connection in the attic that had a new cable run a couple of years ago at my expense to see If perhaps an animal has chewed on the cable.  The 1200 mbps service did work with no errors when it was first switched on. However, last week something happened with either the physical connection or the modem. I am an SCCM engineer so I am a good trouble shooter but I have limited tools with which to diagnose the physical connections. If the new modem does not work, I can safely assume something is not right with the physical connection and I suspect I will have to get xfinity involved and go through their gauntlet of diagnoses I have already done. 

I have reset the modem 3 times. The number of errors here is insane. Both error columns used to be zeros with an occasional correctible. Unfortunately, I don't know if this software version on the modem has recently changed - AB01.02.053.01_112320_193.0A.NSH I wish I would have taken a snapshot of the working configuration.

Hello and thank you for taking the time to reach out to us here on our Xfinity Forums. I am truly sorry for the connection issues you have been experiencing and would love the opportunity to take a look at the signals on our end. Please send us a private message with your name and service address to Xfinity Support by clicking the chat icon at the top right of the page.

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@jcaviani

I'll add that the SNR's were low / marginal on some of the downstream channels in your first and especially your second post. The third post is good. Something intermittent is going on with the line / connection quality somewhere. Seems there may be some spurious noise ingressing into the line(s). Good luck with it !

@ComcastBillie

Unfortunately, the new modem (Arris Surfboard s33) didn't make a difference. It looks like something has changed about my physical connection although I made no changes. I will have to get someone to look at it.  

Thank you so much for reaching out to us through our awesome peer-to-peer chat. I hate to hear this has been your experience and would love to investigate this for you! Please send us a PM with your first and last name, as well as house numbers to your service address. To send us a Private Chat Message, select the message icon in the top right corner and then search for Xfinity support. With our new Xfinity support chat, you do not need to input the name of a person. Just select Xfinity support and you will be able to speak with the next available specialist.

@EG

Agreed, no solution yet. I am having a tech come out tomorrow. I do notice the new modem handles the errors better - don't seem to be dropping out. But, this connection ran for years with zeros in the error columns so I'd like to know what changed. 

@jcaviani 

Thanks for replying ! :-)

Problem was escalated to second tier support. I got a call from a tech who told me he could see the signal going to the modem was optimal (made a point of making him reiterate that information) I have cancelled my service call for the time being so I can test another modem. He said from his experience customers have the most trouble with Arris and Netgear modems and the least with xfinity and Motorola so I will test a Motorola MB8611. Even with the errors, the Arris Surboard 33 performs better than the Arris 8200. Also, I have not ruled out the router (Netgear Orbi AX6000 WiFi Mesh System 3 Pack) as the cause for the internet drop outs since both modems have remained blue and appear to be connected during those episodes, despite all the errors. Moreover, Netgear forces firmware updates that are not always stable and have been reported to cause internet drop outs. Unfortunately, I don't have a screen print of the error free modem and router software combination so all of this is a bit of a guess given that I can't really isolate all the factors. I do know for sure the Arris 8200 worked error free for a long period of time. So, what changed?

Good morning! We truly hate to hear this is happening still. Please send us a PM when you are ready and we can schedule a technician. 

Hi @user_1aed42! Thank you for coming to the Xfinity Community Forum to get help with a solution to the connectivity issues that you've mentioned. Each situation like this can be very unique. A lot of times, the issue can be different things like noise on the line, signal issues, issues with one's node, etc. It's best that we investigate your issue separately so we can help find a cause, then work with you and your local techs to find a resolution. Since this is a thread created by another user, can you please start your own thread with more details of your experience and a the steps that have been taken so far? From there an awesome member of my team can further assist you! We look forward to chatting with you soon.