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Forum Discussion
C7000-100NAS randomly drops internet connection
Hello, My C7000-100NAS modem seems to randomly drop it's Comcast connection. This happen on 2.4 ghz, 5 ghz, and wired connections. There is no pattern, however the dropped connection usually last...
Please PM me on this topic.
we are aware of some resets done by the ISP for specific customers.
did you find a solution to the problem...?? Same issue (timing sync failure) . Did reset, comcast checked----only wifi, ethernet works fine....
The C7000 was the problem. Spent a lot of time narrowing down the issue with the help of Comcast. They were very helpful, the tech even gave me his personal cell and helped with some diagnositcs off the clock. I did the typical reset, did not help. Did the factory restore...did not help. The C7000 would actually drop the WAN connection every 20 minutes. Nothing in the logs would indicate trouble, other than the Sync issues I noted earlier. Ruled out every device on the network. My only option was to replace the C7000. Netgear never responded. I will try and return it later this week because its still under warranty. Additional proof that it was the C7000, I replaced it with a Netgear CM1000 and it has been rock solid since minute one...no other changes on the network.
it´s a shame, but thanks!!!!
Have not solved it yet. Changed DNS from Comcast to another DNS. There are fewer hits against the cable modem, but our issues are happening in both Wifi and Wired.
2017-4-9, 18:50:16 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:xx:xx:xx;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.1;CM-VER=3.0; Our MAC address is the first one listed in the event log. CMTS-MAC=00:01:5c:7f:9a:5a I believe is a Comcast Server somewhere.
The nic was made by MAC-Addr 00-01-5C-7F-9A-05 CADANT INC., USA
4343 Commerce Court - Ste. #207 - Lisle IL 60532.In our case I think that the issue has to do with stability of Comcast because of our last test which showed packet loss. I can get about 5 seconds of the beginning of calls, then nothing for about 20 seconds, then the call is ok. It is intermittent. If something would just break, we would know where the issue lies.