Intermittent Dropping and Weak Speeds with Gigabit Xfinity

[beachlivin2020]

Hello, 

I have been a long time Xfinity customer. We just recently upgraded to gigabit and were very excited. We have recently started stressing the bandwidth since being in quarantine. 

In short, we have had intermittent issues either dropping out at least once a day or bandwidth simply dropping to below 5 mbps. We also only get about max 150 right next to the gateway w/ 5 min fluxuations to 450 then back down. 

We had an old Netgear C7800 modem/router combo set to bridge mode w/ Eero as router. I have now swapped the netgear for a SB8200.

I have looked at other posts, so if it helps here are the stats from my modem:

 Any help would be appreciated. Thank you!

[beachlivin2020]

Replying with the data since it looks like the photos did not take the first time:

Procedure	Status	Comment
Acquire Downstream Channel	489000000 Hz	Locked
Connectivity State	OK	Operational
Boot State	OK	Operational
Configuration File	OK
Security	Enabled	BPI+
DOCSIS Network Access Enabled	Allowed

Downstream Bonded Channels
Channel ID	Lock Status	Modulation	Frequency	Power	SNR/MER	Corrected	Uncorrectables
2	Locked	QAM256	489000000 Hz	3.1 dBmV	40.5 dB	20	32
3	Locked	QAM256	495000000 Hz	3.2 dBmV	40.4 dB	31	30
4	Locked	QAM256	501000000 Hz	3.5 dBmV	40.5 dB	32	29
5	Locked	QAM256	507000000 Hz	3.8 dBmV	40.5 dB	29	32
6	Locked	QAM256	513000000 Hz	3.6 dBmV	40.4 dB	11	31
7	Locked	QAM256	519000000 Hz	3.6 dBmV	40.5 dB	18	29
8	Locked	QAM256	525000000 Hz	3.3 dBmV	40.5 dB	12	29
9	Locked	QAM256	531000000 Hz	3.2 dBmV	40.6 dB	8	34
10	Locked	QAM256	537000000 Hz	3.6 dBmV	40.5 dB	21	31
11	Locked	QAM256	543000000 Hz	3.6 dBmV	40.6 dB	12	31
12	Locked	QAM256	549000000 Hz	3.8 dBmV	40.6 dB	39	34
13	Locked	QAM256	555000000 Hz	3.5 dBmV	40.6 dB	19	30
14	Locked	QAM256	561000000 Hz	3.2 dBmV	40.5 dB	8	33
15	Locked	QAM256	567000000 Hz	3.1 dBmV	40.4 dB	7	32
16	Locked	QAM256	573000000 Hz	2.6 dBmV	40.3 dB	14	29
17	Locked	QAM256	579000000 Hz	2.8 dBmV	40.4 dB	13	30
18	Locked	QAM256	585000000 Hz	2.8 dBmV	40.5 dB	10	34
19	Locked	QAM256	591000000 Hz	2.8 dBmV	40.4 dB	8	35
20	Locked	QAM256	597000000 Hz	2.7 dBmV	40.3 dB	17	32
21	Locked	QAM256	603000000 Hz	2.6 dBmV	40.3 dB	12	28
22	Locked	QAM256	609000000 Hz	2.3 dBmV	40.2 dB	18	33
23	Locked	QAM256	615000000 Hz	1.9 dBmV	40.1 dB	12	27
24	Locked	QAM256	621000000 Hz	1.8 dBmV	40.1 dB	13	31
25	Locked	QAM256	627000000 Hz	1.4 dBmV	39.8 dB	19	30
26	Locked	QAM256	633000000 Hz	1.7 dBmV	40.0 dB	13	33
27	Locked	QAM256	639000000 Hz	1.2 dBmV	39.8 dB	16	29
28	Locked	QAM256	645000000 Hz	1.6 dBmV	39.9 dB	8	31
29	Locked	QAM256	651000000 Hz	1.1 dBmV	39.7 dB	11	28
30	Locked	QAM256	657000000 Hz	0.6 dBmV	39.6 dB	19	30
31	Locked	QAM256	663000000 Hz	0.5 dBmV	39.5 dB	7	28
32	Locked	QAM256	669000000 Hz	0.4 dBmV	39.4 dB	8	34
37	Locked	Other	690000000 Hz	0.6 dBmV	37.0 dB	163030398	0

Upstream Bonded Channels
Channel	Channel ID	Lock Status	US Channel Type	Frequency	Width	Power
1	86	Locked	SC-QAM Upstream	29400000 Hz	6400000 Hz	43.0 dBmV
2	85	Locked	SC-QAM Upstream	35800000 Hz	6400000 Hz	44.0 dBmV
3	87	Locked	SC-QAM Upstream	23000000 Hz	6400000 Hz	43.0 dBmV
4	88	Locked	SC-QAM Upstream	16600000 Hz	6400000 Hz	42.0 dBmV

Event Log:

04/19/2020 23:16	74010100	6	"CM-STATUS message sent. Event Type Code: 24; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 1 2 3.;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 23:16	74010100	6	"CM-STATUS message sent. Event Type Code: 22; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 23:16	74010100	6	"CM-STATUS message sent. Event Type Code: 23; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 23:16	74010100	6	"CM-STATUS message sent. Event Type Code: 16; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 1 2 3.;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 23:16	74010100	6	"CM-STATUS message sent. Event Type Code: 20; Chan ID: 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 18:13	67061600	6	"DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	2436694066	6	"Honoring MDD; IP provisioning mode = IPv6"
01/01/1970 00:00	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 18:04	84000500	3	"SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 17:04	84000500	3	"SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 17:04	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 17:03	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 17:02	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 17:02	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 17:02	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 17:01	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 17:01	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 16:06	82000400	3	"Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 16:06	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 16:06	82000400	3	"Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 16:06	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 16:03	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 16:01	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 15:58	2436694044	3	"Resetting the cable modem due to docsDevResetNow"
01/01/1970 00:00	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
04/19/2020 15:53	84000500	3	"SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:01	82000200	3	"No Ranging Response received - T3 time-out;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:01:5c:84:c0:5b;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:01	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:01	84000200	3	"SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:01	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:01	84000200	3	"SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:01	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"
01/01/1970 00:00	2436694048	3	"Telnet user logged in from IP address 192.168.100.101."
01/01/1970 00:00	84000100	3	"SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=a4:98:13:fc:e9:7d;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;"

[JAY202]

I had a different same issue with another Netgear modem/router (C7800). When I looked at the logs there were also time and sychronization failures, so this might help.

The issue is related to a firmware update (V3.01.43) that is pushed out from the ISP (which now has to do all the firmware updates). Unplug the coax or ethernet from the ISP. Push in the factory reset button on the modem (one that you need to use a paperclip, small hole usually next to the power button). Then re-hook the cable or etherent connection. this should resync the ISP and  firmware should update. Even though I pressed the factory reset button, all of my setting were still there after it reintialized.

Hope this helps. I got the solution from Reddit and not Netgear or Xfinity.