Consistent outages, Support denies issue exists

@user_3f39e6​  You may not want advice from "volunteer experts", but you'll find Xfinity support can only provide an up sell for a service plan or schedule a tech visit.  Many of us have solved our own issues.

Your 82/24 errors a a communication failure with the DHCPv6 server upstream.  Your limited gear does not provide the IPV4 conversation.  That's also normal on a power cycle or reboot.  Your connection likely isn't up while those attempts are going on, so no communication can take place.  It retries in semi-random intervals in that state.  Take a look at your time stamps and router startup message.  Eventually, you are getting an IPV4 and IPV6 address.  If it was just failing the IPV6, I'd say that might be your issue with an IPV6  lease release before a renew, but since you are trying to get BOTH IPV4 and IPV6 leases at the same time, that looks more like you are coming back from a spontaneous reboot to me -- from your limited log post.  

Most of the time, random reboots are signal related.  Likely culprits are downstream power coming in too hot and overloading the front end, or your are trying to push too much power out upstream through a bad or degrading connector/spitter and that's causing your reboot.  Signal power will also drift over time.  If you want to take a look at it yourself, you can start here and perhaps save some cash on a tech visit if it's a local wiring/bad component hanging off of your coax.  Pay particular attention to the signal power levels and correctable/uncorrectable errors:  https://forums.xfinity.com/conversations/your-home-network/internet-troubleshooting-tips/602dae4ac5375f08cde52ea0  

Appreciate the response.

So far I have already been upsold to new equipment on the recommendation of support.  They told me this would fix the issue.  I reluctantly agreed to the upsell, knowing it would not fix the problem.  Here we are, brand new equipment same problem.

I have run through the troubleshooting you linked many times.  

• there is no service interruption
• i have not changed my service
• my modem is compatible, it was picked up at my local Xfinity retail location within the last few weeks
• my problem is not router based, i am hard line directly into modem
• i have rebooted more times than i can count
• i am not using any splitters.  i am using the brand new cable that came with my brand new modem

I do sincerely appreciate your response.

I do not care if the tech visit costs me money, I need an always on internet connection.  I pay for it and my job relies on it.  I need this resolved at any cost.

@user_3f39e6​

The signal table you are looking for would look more or less like the one in this post:  https://forums.xfinity.com/conversations/your-home-network/sync-timing-synchronization-failure-ucd-invalid-or-channel-unusable/6500812dbaecdd4ece056def

You want to be able to see the upstream/downstream signal power, SNR, any errors both correctable and uncorrectable, etc.  That might give an indication of the type of problem you are looking for.  Might be on the front management page under "connection".  I don't use Xfinity/Technicolor hardware.

@flatlander3​ 

checked it again just now after another drop.  my uncorrectable codewords are now 0 on all channels except for channel 4.

downstream power is a little higher, closer to the -7 range than the -9/-10 range from my previous post.

I am not using any splitters or amps.  I have one single coax cable running directly from wall outlet to device.  Cable is brand new, came with the modem a couple weeks ago.

well, uncorrectable code words are back in numbers on all channels.  I must have pulled the data too soon after it was back online.

power levels a little lower as well.

@user_3f39e6 Thank you so much for all this information and for making a post on our Forums. We are happy to work with you and take a deeper look into the signal and the network going into your home. Please send us a DM with your full name and service address to get started. Here's the detailed steps to direct message us: 
• Click "Sign In" if necessary 
• Click the "Peer to peer chat" icon (upper right corner of this page) 
• Click the "New message" (pencil and paper) icon 
• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list 
• Type your message in the text area near the bottom of the window 
• Press Enter to send your message
 

@user_3f39e6​ Did you have a chance to look for components like splitters or an active component like an amplifier attached to your coax?  You can also schedule a tech to come out and look at it if you don't want to.

This one isn't going to fix itself, and there isn't anything they can fix remotely. 

@user_3f39e6​ 

All set for tomorrow, and we will check in again after the visit to see how it goes. You will be able to see the appointment through the Xfinity app within the hour as well. If you have any questions before then, we are always happy to help any way we can. 

Once it shows up in the Xfinity app, that is the confirmation. It can take up to an hour, but you might be able to see it already at this time. 

That is the phone number I put on for the visit, and I can confirm the appointment is in on my end. As long as [edited personal info]is at least 18, it will be fine for him to be present for the visit. 

@user_3f39e6​