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Modem Disconnections

post #1 of 5
Thread Starter 
So I've been having off and on issues lately with my modem dropping connection. I've been on the phone with my ISP and everyone around has been relatively baffled by the seemingly random issues.

I started doing some traces and basically right after the modem I would start getting packet loss. I sent these to the ISP phone techs (I got all the way up to level 3, yay!) and they forwarded it to their engineers. I never heard anything back.

About a week ago, I noticed that whenever my wife logged in to play some GW2, the modem would disconnect completely. If she got on and just surfed the web or something it would be fine. During the intervening time, I had a new case to put her machine into, so the problem went away for a few days.

Last night after I finally had time to finish it up, I plugged everything back up and booted it up. The modem immediately disconnected. I shut the machine back down and it immediately reconnected. This is 100% repeatable.

So far I've excluded;

The modem - Works in any way with any combination of PCs (wired/wireless) minus my wives.
The router - Bypassing it and plugging her machine directly into the modem causes the same problem.
The cable - Bypassed again.
The OS - Booting directly to BIOS crashes the modem.

Anyone have any ideas? I don't really understand the modems logs; I removed the MAC IDs in an attempt to decrease width.

1 - Aug 19 2013 17:50:47 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

2 - Aug 19 2013 17:50:47 6-Notice N/A TLV43 ERROR: ;CM-(MAC-ID);CMTS-(MAC-ID)f;CM-QOS=1.1;CM-VER=3.0;

3 - Aug 19 2013 17:50:27 5-Warning T07.0 RCS Partial Service;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

4 - Aug 19 2013 17:50:26 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

5 - Aug 19 2013 17:50:26 6-Notice N/A TLV43 ERROR: ;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

6 - Jan 01 1970 00:08:38 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

7 - Jan 01 1970 00:08:35 5-Warning R09.0 B-INIT-RNG Failure - Retries exceeded;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

8 - Jan 01 1970 00:08:32 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

9 - Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=f8:0b:be:dc:ca:4d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;

10 - Aug 19 2013 17:28:23 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

11 - Aug 19 2013 17:28:19 5-Warning T202.0 Lost MDD Timeout;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

12 - Aug 19 2013 17:27:57 3-Critical T05.0 SYNC Timing Synchronization failure - Loss of Sync;(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;

13 - Aug 19 2013 17:21:15 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-(MAC-ID);CMTS-(MAC-ID);CM-QOS=1.1;CM-VER=3.0;
Edited by m0bius - 8/19/13 at 5:02pm
post #2 of 5
Looks like the modem is spazzing out and rebooting judging by the timestamp.
Any chance on hardware replacement?
post #3 of 5
Thread Starter 
Actually I forgot to mention that I've replaced the modem in the time frame. The one we had before was ancient.
post #4 of 5
have you had the ISP techs out to see what kind of signal stats you are getting on the line? i dont think the issue is being caused by the PC, but more likely a line that doesnt like your new modem setup or a bad modem that isnt handling the load its being put under. maybe even both.
post #5 of 5
Thread Starter 
As it turns out... It was the power supply. I can only assume it was a grounding issue. I checked the signal stats the modem was reporting, everything was within reason.

I took my rig and and used her power supply and the modem would disconnect. I installed my backup PSU in her rig and it's off and running again. Thanks for your replies.
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