NETGEAR c7000v2 slow speed with blinking lights

Question

I have 200 Mbps connection and I get around 120-180 Mbps during the day. At nights, it gets slow. (20-40 Mbps).

These lights are blinking a green light on the router:

Download arrow
2.4GHz icon
5 GHz icon

In cable connection page, I see "Downstream Bonded Channels (Partial Service)" but not sure what it means. I've tried restarting the router, but it didn't seem to help much.

Firmware Version

V1.03.03

Startup Procedure

Procedure	Status	Comment
Acquire Downstream Channel	651000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Security	Enabled	BPI+
IP Provisioning Mode	Honor MDD	honorMdd(4)

Downstream Bonded Channels (Partial Service)

Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	44	651000000 Hz	-0.5 dBmV	39.1 dB	1480	853
2	Locked	QAM256	24	531000000 Hz	-0.9 dBmV	38 dB	4603	1218
3	Locked	QAM256	25	537000000 Hz	-0.8 dBmV	39.5 dB	2332	674
4	Locked	QAM256	26	543000000 Hz	-0.7 dBmV	39.5 dB	2063	1254
5	Locked	QAM256	27	549000000 Hz	-0.8 dBmV	39.4 dB	1713	926
6	Locked	QAM256	28	555000000 Hz	-0.9 dBmV	39.2 dB	2434	963
7	Locked	QAM256	29	561000000 Hz	-0.8 dBmV	38.1 dB	5	0
8	Locked	QAM256	30	567000000 Hz	-0.8 dBmV	38.8 dB	2663	993
9	Locked	QAM256	31	573000000 Hz	-0.8 dBmV	39.2 dB	1970	838
10	Locked	QAM256	32	579000000 Hz	-0.7 dBmV	39.1 dB	2352	981
11	Locked	QAM256	33	585000000 Hz	-0.6 dBmV	39.1 dB	2131	904
12	Locked	QAM256	34	591000000 Hz	-0.6 dBmV	38.8 dB	2330	921
13	Locked	QAM256	35	597000000 Hz	-0.6 dBmV	37.6 dB	2986	794
14	Not Locked	Unknown	36	603000000 Hz	0.0 dBmV	0.0 dB	0	0
15	Locked	QAM256	37	609000000 Hz	-0.5 dBmV	32.9 dB	271538148	36048345
16	Locked	QAM256	38	615000000 Hz	-0.6 dBmV	39.5 dB	2111	865
17	Locked	QAM256	39	621000000 Hz	-0.8 dBmV	39.7 dB	0	0
18	Locked	QAM256	40	627000000 Hz	-0.8 dBmV	38.7 dB	0	0
19	Locked	QAM256	41	633000000 Hz	-0.8 dBmV	37.2 dB	0	0
20	Locked	QAM256	42	639000000 Hz	-0.5 dBmV	39.4 dB	0	0
21	Locked	QAM256	43	645000000 Hz	-0.4 dBmV	39.9 dB	0	0
22	Locked	QAM256	45	657000000 Hz	-0.7 dBmV	39.5 dB	0	0
23	Locked	QAM256	46	663000000 Hz	-0.7 dBmV	39.5 dB	0	0
24	Locked	QAM256	47	669000000 Hz	-0.6 dBmV	39.9 dB	0	0

Upstream Bonded Channels

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	7	5120 Ksym/sec	29200000 Hz	51 dBmV
2	Locked	ATDMA	5	5120 Ksym/sec	16400000 Hz	53 dBmV
3	Locked	ATDMA	6	5120 Ksym/sec	22800000 Hz	52.5 dBmV
4	Locked	ATDMA	8	5120 Ksym/sec	35600000 Hz	49.8 dBmV
5	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
6	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
7	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV
8	Not Locked	Unknown	0	0 Ksym/sec	0 Hz	0.0 dBmV

Extended Upstream Transmit Power

Enable Extended Upstream Transmit Power

Current System Time:Fri Dec 03 21:50:00 2021

System Up Time:19 days 13:47:28

timmyK · Answer

This is the connection page after restarting the router. Speed seems faster now but the lights are still blinking.&nbsp;Startup ProcedureProcedureStatusCommentAcquire Downstream Channel651000000 HzLockedConnectivity StateOKOperationalBoot StateOKOperationalSecurityEnabledBPI+IP Provisioning ModeHonor MDDhonorMdd(4)&nbsp;Downstream Bonded Channels (Partial Service)ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUncorrectables1LockedQAM25644651000000 Hz-0.3 dBmV39.7 dB002LockedQAM25624531000000 Hz-0.8 dBmV38.7 dB003LockedQAM25625537000000 Hz-0.6 dBmV40.2 dB004LockedQAM25626543000000 Hz-0.6 dBmV40.1 dB005LockedQAM25627549000000 Hz-0.7 dBmV40.1 dB006LockedQAM25628555000000 Hz-0.7 dBmV39.8 dB007LockedQAM25629561000000 Hz-0.7 dBmV39 dB008LockedQAM25630567000000 Hz-0.7 dBmV39.5 dB009LockedQAM25631573000000 Hz-0.6 dBmV39.9 dB0010LockedQAM25632579000000 Hz-0.5 dBmV39.7 dB0011LockedQAM25633585000000 Hz-0.4 dBmV39.8 dB0012LockedQAM25634591000000 Hz-0.4 dBmV39.4 dB0013LockedQAM25635597000000 Hz-0.4 dBmV38.1 dB0014Not LockedUnknown36603000000 Hz0.0 dBmV0.0 dB0015LockedQAM25637609000000 Hz-0.4 dBmV33.4 dB51928906616LockedQAM25638615000000 Hz-0.4 dBmV40.1 dB0017LockedQAM25639621000000 Hz-0.6 dBmV40.5 dB0018LockedQAM25640627000000 Hz-0.6 dBmV38.8 dB0019LockedQAM25641633000000 Hz-0.6 dBmV38.6 dB0020LockedQAM25642639000000 Hz-0.4 dBmV40.2 dB0021LockedQAM25643645000000 Hz-0.2 dBmV40.8 dB0022LockedQAM25645657000000 Hz-0.5 dBmV40.3 dB0023LockedQAM25646663000000 Hz-0.6 dBmV40.3 dB0024LockedQAM25647669000000 Hz-0.4 dBmV40.3 dB00&nbsp;Upstream Bonded ChannelsChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower1LockedATDMA65120 Ksym/sec22800000 Hz52.3 dBmV2LockedATDMA55120 Ksym/sec16400000 Hz53.3 dBmV3LockedATDMA75120 Ksym/sec29200000 Hz50.8 dBmV4LockedATDMA85120 Ksym/sec35600000 Hz50 dBmV5Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV6Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV7Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV8Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV&nbsp;Extended Upstream Transmit PowerEnable Extended Upstream Transmit Power&nbsp;Current System Time:Fri Dec 03 22:14:49 2021System Up Time:00:08:27

plemans · Answer

Are you using an amplifier? Based off the power levels that you have for your downstream, your upstream is pretty high.&nbsp;
If you have any amplifiers, splitters, or signal attenuators in the line, remove them.&nbsp;
&nbsp;
do you also have the modem event logs? That helps us check long term.&nbsp;
All rebooting does is clear out the errors. It might help the speeds short term if the modem connects on a different frequency but long term, it isn't going to fix the problem.&nbsp;

timmyK · Answer

plemans&nbsp;Thanks for the reply. I don't have any amplifier setup. I hooked up the ISP cable directly into my router&nbsp;Connection seems to be stable now, but the lights on the router are still blinking. (downstream arrow, 2.4ghz, 5 ghz icons).&nbsp;&nbsp;Attaching the event logs:(Advanced &gt; Administration &gt; Event Logs)TimePriorityDescription2021-12-3, 22:13:04Warning (5)MDD message timeout;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.1;CM-VER=3.0;1970-1-1, 00:00:45Notice (6)Honoring MDD; IP provisioning mode = IPv61970-1-1, 00:00:40Notice (6)WiFi Interface [wl1] set to Channel 153 (Side-Band Channel:N/A) - Reason:INIT1970-1-1, 00:00:40Notice (6)WiFi Interface [wl0] set to Channel 2 (Side-Band Channel:N/A) - Reason:INIT1970-1-1, 00:00:37Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;2021-11-24, 12:22:52Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.1;CM-VER=3.0;2021-11-15, 12:35:58Critical (3)SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.1;CM-VER=3.0;1970-1-1, 00:00:37Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;2021-11-8, 22:48:10Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.1;CM-VER=3.0;1970-1-1, 00:39:09Critical (3)No Ranging Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:39:03Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:38:58Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:38:56Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:38:55Critical (3)DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:38:07Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:38:06Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:38:03Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:37:24Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:37:22Critical (3)DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:36:35Critical (3)No Ranging Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:36:31Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:36:29Critical (3)No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:36:12Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:36:11Critical (3)No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:35:54Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:35:53Critical (3)No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:35:29Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:35:28Critical (3)DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:34:41Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:34:40Critical (3)No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:34:23Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:34:22Critical (3)No UCDs Received - Timeout;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:34:05Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:34:04Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:34:03Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:34:01Critical (3)DHCP failed - DHCP Solicit sent, No DHCP Advertise received;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:33:14Critical (3)No Ranging Response received - T3 time-out;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:33:08Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:33:08Critical (3)SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;1970-1-1, 00:33:06Critical (3)SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=28:80:88:4d:0b:98;CMTS-MAC=00:01:5c:65:0e:72;CM-QOS=1.0;CM-VER=3.0;And here is the logs (Advanced &gt; Administration &gt; Logs)&nbsp;I was very concerned about DoS attack at first, but then read online that it's a false alarm due to iPhone or iPad devices.https://community.netgear.com/t5/Cable-Modems-Routers/DoS-attack-Teardrop-or-derivative-Ping-of-Death-strange-IPv6/m-p/2051922/highlight/true#M30355admin login failure] from source 192.168.0.211Mon Dec 06 13:01:03 20210.0.0.0:0192.168.0.21:0[DoS attack: Ping Of Death] from 73.1.0.80, port 03Mon Dec 06 12:49:22 2021232.215.176.155:073.1.0.80:0[DoS attack: Teardrop or derivative] from 73.1.0.80, port 01Mon Dec 06 12:49:20 2021232.215.176.155:073.1.0.80:0[DoS attack: Ping Of Death] from 73.1.0.80, port 02Mon Dec 06 12:48:36 2021232.215.176.155:073.1.0.80:0[DoS attack: Teardrop or derivative] from 73.1.0.80, port 02Mon Dec 06 12:48:35 2021232.215.176.155:073.1.0.80:0[DoS attack: Ping Of Death] from 73.1.0.80, port 08Mon Dec 06 12:46:33 2021232.215.176.155:073.1.0.80:0&nbsp;

plemans · Answer

The 2.4ghz/5ghz lights will blink. That just indicates data transfer.&nbsp;
the downstream icon should be locked.&nbsp;
You are having error and not locked channels.&nbsp;
And while your power is technically in spec, somethings causing issues. That can be told by how high your upstream power levels are in relation to your downstream. Add in the errors and not locked channels and I'd be checking the cable/wires/connectors.&nbsp;
If that doesn't help, then the ISP would need to check the line.&nbsp;

Forum Discussion

NETGEAR c7000v2 slow speed with blinking lights