Random 5 minutes outages each day. Worse in last few weeks. New Modem and levels within spec.

Now after many months of this issue, had a tech out a month ago, re did a few connections, recommended a different brand modem. Bought an Arris modem vs the netgear ones I was trying. A week later issues returned.

A week or so later I rang in the issue and got a second tech out who replaced a few connections and tightened one, recommended trying a DOCSISS 3. 1 modem. Bought a DOCSISS 3.1 modem to no avail $170 later (am returning it).

Had a 3rd tech out who headed the notes and happened to be here on a particularly bad outage day. He saw the signal noise and noticed some bad practices at the amplifier at the street so now the trucks will roll and the issue is being pushed up to the Mainline techs and possibly construction to fix some issues which are apparently glaring.

Glad to see just calling techs out whenever the issue isn't fixed seems to help elevate the problem.

Lastly before the pandemic I was working at home Wednesdays and for over a year I had a outage once a day around Noon. Possible that was a hint of this issue. Hope my experience helps others.

Modems I tried are below.

Netgear CM400

Netgear CM500

Arris SB6183

Netgear CM100

Can't see your pics. Since you are a new poster, they need to be approved by a Forum Admin. That could take some time. In the interim, you could try hosting them at one of those free third-party pic hosting sites like Imgur or Photobucket and post the link to them here.

Thank you I posted them on imgur and updated the post with a link. 

Inspect the demarcation point coax connections outside the building.    Symptoms are consistent with those connections being waterlogged and/or oxidized and/or loose enough that sunlight or daytime heat is enough to degrade the signal significantly because electrical resistance increases with heat.

If the demarcation point is not 100% enclosed in a grey plastic box about 6 inches square and 100% isolated from water & sunlight, it is not up to current spec and is due to be swapped anyway.   

If all this fits your situation, describe the symptoms to tech-support including the fact that you found degraded cables/connectors exposed to the elements outside and they should roll a truck at no cost to you to fix it.    Let us know how it goes...     Best regards...

The connectors that you photographed and reseated tightly are not so bad but maybe not 100% perfect 100% shiny like I want to see. 

The demarc and the box near the street each appear to have been hydro-seeded or sprayed reliably by irrigation system like at my old place.     The photo inside the box shows that liquid/mud has penetrated at least once.   

The big connector is loose from wherever it should be tightened but maybe you loosened it in order to check the cables and photograph.    When you found the connectors, was the big connector thing near the bottom where it would be submerged if the box filled with water?  

At least one visible cable outside the boxes appears to have undergone multiple space-shuttle reentries.     

Reseating/retightening may appear to solve the problem for a while but it will be temporary.   I am pretty sure a legit tech would swap every visible cable and connector.   I see you photographed the far end of the cable near street too - cool - that is well beyond the call of duty.   Everything from demarc outwards is owned by the ISP and is their responsibility to fix.      

The signal stats are o/k but the error log entries indicate that something is going on. Perhaps there is noise ingress into the line(s) somewhere.

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.

I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They will be able to poll the CMTS to see whether or not everything is in the green zone, see your node / cable plant and modem health, and also see a history plot for the modem. You should get a reply here in your topic. Good luck !

Hello, ATrudeau24115! 

I'm so glad you reached out to us here about the intermittent connection you are experiencing. I would love to take a closer look to verify the situation. Just reading over the comments here it sounds like we may need to get a tech out for repairs, and I can help you set that up! Please send me a private message with your first and last name, as well as your service address so I can assist. 

 To send a private message, click my name "ComcastTambrey", then click "send a message".

Thanks for the update! I'm glad to hear it has been much better since the reset. You may not need a tech at this point, but if you would like, I can still double-check your levels on our back-end to see if we still need to keep an eye out for issues or if you are in the clear! 🙂

hi - I thought i saw dried dirt on outside of the boxes and at least one cable - maybe it was from rain instead of lawn sprinkler.   the 'reentry' comment was for a cable extending downwards vertically from the demarc - i see now from your comment that i was seeing the outside of a metal pipe.    there could be water and corroded cable inside that pipe too.   the fact that you saw a change in behavior after disconnecting/reconnecting the coax cables strongly indicates that the root-cause of problem relates to the demarc connections.     Glad you are seeing an improvement.    If the performance degrades again, you will know where to look and/or to point the tech!     best regards.