Random Disconnects in River Ridge / Elmwood, Louisiana Area

If you could go to http://192.168.100.1 and post the signal levels as well as the modem log that would be quite helpful.

Sounds like you have done everything possible to prove that your equipment is not the source of the intermittent problem, Ron.   I went through this about 2 years ago.  I upgraded to a Motorola SB6120 DOCSIS 3.0 modem to replace what I thought could be a failing DOCSIS 2.0 modem  That didn't solve the problem.   I still had an intermittent problem with dropping lights and connections.   Cox came out and replaced the splitters and connectors on the coaxial cabling for the house.  This resulted in an improvement but didn't solve the problem completely.  Finally, Cox came out again and made measurements with some kind of spectrum analysis gear and isolated the problem to the coaxial cable run feeding my modem.   The problem apparently wasn't with the signal level but was with another parameter that was measured as bad.    They replaced the coaxial cable run and that solved the problem.

Recently, I have been experiencing intermittent loss of response during the evening hours.   The lights on my modem look fine, but I lose Internet response.   My cable modem log is showing some errors.

It appears at though the issue may be with the upstream signal/channel.  When was the last time a technician was out to take a look at things?

I have been corresponding with LHSIhelp on dslreports.com and he reviewed as well and said that an engineer moved my modem to a different upstream channel.  Will this help?  He has a long history of helping people there.  

But yes, I had a tech, he stuck a reader on the line from the splitter by the TV and said everything was fine, but that was a couple weeks ago.  LHSIhelp made the changes I mentioned today.

Thank you sir.

Reminder: this is a brand new modem with new cables.

Thanks Rob.  It's deeply frustrating for me, because the bills certainly aren't cheap for the service I am getting, and they come out on time and consistently too.  There are few alternatives in my area, as I consider Uverse to even be of lower quality than Cox.  Unfortunately, Cox has purchased our polticians and has a monopoly on cable here, so they're the only game in town when trying to get HSI.

I am not blaming the folks like Chris or the helpful Cox rep on dslreports.com, I am frustrated with the structure itself, and the inability to locate this problem or spend the time from the higher-ups to push down a response.

Did it again about 30-45 minutes ago.  No power outage reported in the area according to the cox rep on the phone.  Stayed out for about 20 mins as I was online trying to pay for school.

Keeping an eye on this garbage service.  Did it again just now.  Complete blinkout, no warning, all lights on modem out except power.  Fail.

And again ... a watched pot DOES boil, apparently.

Just a note: whatever they did, did NOT work.  The only other alternative I can think of on my end would be to get a loaner modem from them that ISN'T a Motorola.  Maybe its something weird with the motorola, since both my docsis 2 and now 3 are Motorola.

have similar issues to you and though the same thing, replace the motorola with something else, didn't help.  Although in my case, the motorola lights would go out during these issues and with the Zoom, the lights stay on.

It's a shame, really.  I have read on the Cox HSI forums on dslreports.com that it could be the coaxial cabling that is gone bad outside.  But the oddest thing about it is that this happens during the day (from about 10 AM until 3-5PM).  I suppose its because the wires heat up at this time and the expansion causes the problems.

Just gotta keep hammering away at their customer support until they fix it.  I've got tenacity.  I'll do so.

Chris, I am trying to research this problem myself and I see the same problem from users posting from the left coast to the other.  Started Unicast Maintenance Ranging - No Response received - T3 time-out

It seems as though you have yet to resolve the issue for anyone.  

My firewall is also reporting consistent DOS attacks as well as I have seen other users posting about that same issue.  Big picture, what is Cox doing to look at/resolve this issue that is obviously service impacting, nationwide and cannot go on forever?

The T3 errors don't represent a systematic problem or one that can be completely eliminated however in large enough quantities they can indicate there is a problem with the return path signal from the modem to us.  DOS attacks wouldn't affect the modem or logs so you wouldn't see such evidence there. If you have a Netgear router it may be experiencing a firmware bug where it continuously sends DNS queries.  That would need to be addressed by Netgear.