c7800 losing connection

Question

Hello all,&nbsp;I have a c7800 router and it had previously been working fine. Over the past couple months I have been getting intermittent dropouts. It typically is fixed by unplugging and rebooting the router. When I pull up the error logging from my router's gateway, here are the lines I got for the latest disconnect. I plan on calling the ISP to have a tech come out and check the lines as well as try to get them to push any firmware updates since I cannot update it through the gateway myself (My current firmware is V3.01.36 and I know that is old, but there isn't a specific listing for my ISP [Atlantic Broadband]). However, I am not the most familiar with this so I was wondering if anyone sees the problem directly with these error messages. Thanks for any help!&nbsp;2021-04-23, 09:27:11.0Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:27:20.0Critical (3)No Ranging Response received - T3 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:27:24.0Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:27:33.0Critical (3)No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:27:39.0Critical (3)No Ranging Response received - T3 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedCritical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv4Time Not EstablishedWarning (5)DHCP WARNING - Non-critical field invalid in response ;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Error (4)Missing BP Configuration Setting TLV Type: 17.1;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Error (4)Missing BP Configuration Setting TLV Type: 17.2;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Error (4)Missing BP Configuration Setting TLV Type: 17.3;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Error (4)Missing BP Configuration Setting TLV Type: 17.4;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Error (4)Missing BP Configuration Setting TLV Type: 17.5;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Error (4)Missing BP Configuration Setting TLV Type: 17.6;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Error (4)Missing BP Configuration Setting TLV Type: 17.7;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Error (4)Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Error (4)Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:51.0Notice (6)TLV-11 - unrecognized OID;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:29:58.0Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;2021-04-23, 09:30:02.0Error (4)Improper Configuration File CVC Format2021-04-23, 09:30:41.0Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;

FURRYe38 · Answer

Lots of ISP problems from your post.&nbsp;Have the ISP check the signal and line quality UP to the modem.&nbsp;Be sure the ISP provisions the modem correctly.Be sure there are no coax cable line splitters in the between the modem and ISP service box.&nbsp;Be sure your using good quality RG6 coax cable up to the modem.&nbsp;Be sure to power OFF the modem for 1 minute them back ON.https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853

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c7800 losing connection

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2021-04-23, 09:27:11.0	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:27:20.0	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:27:24.0	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:27:33.0	Critical (3)	No Maintenance Broadcasts for Ranging opportunities received - T2 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:27:39.0	Critical (3)	No Ranging Response received - T3 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv4
Time Not Established	Warning (5)	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Error (4)	Missing BP Configuration Setting TLV Type: 17.1;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Error (4)	Missing BP Configuration Setting TLV Type: 17.2;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Error (4)	Missing BP Configuration Setting TLV Type: 17.3;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Error (4)	Missing BP Configuration Setting TLV Type: 17.4;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Error (4)	Missing BP Configuration Setting TLV Type: 17.5;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Error (4)	Missing BP Configuration Setting TLV Type: 17.6;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Error (4)	Missing BP Configuration Setting TLV Type: 17.7;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Error (4)	Missing BP Configuration Setting TLV Type: 17.8;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Error (4)	Missing BP Configuration Setting TLV Type: 17.9;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:51.0	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:29:58.0	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;
2021-04-23, 09:30:02.0	Error (4)	Improper Configuration File CVC Format
2021-04-23, 09:30:41.0	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=78:d2:94:ff:07:40;CMTS-MAC=d4:2c:44:7d:1a:ae;CM-QOS=1.1;CM-VER=3.1;