Internet is not stable - Cox recommended replacing modem still having issues

Question

The whole house started dropping 12/28 at about 4pm.&nbsp; The router is an AC1750 Archer C7 v1 (bought 2014) the modem was a SB6141&nbsp;(bought 2013) but Cox recommended replacing it so I did - to a SB6183.&nbsp; I have a new router arriving tomorrow, so maybe it's the C7 but the modem has some interesting log data below - I removed the MAC address.&nbsp; I also added the signal data as well.

Can anyone help as Cox is scheduled to test the node but it's going to cost $75.&nbsp; Is there a way I can test?&nbsp;

Thank you in advance for any recommendations.

Time
Priority
Description

Wed Jan 02 01:24:35 2019
Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;

Wed Jan 02 01:23:48 2019
Notice (6)
TLV-11 - unrecognized OID;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;

Time Not Established
Warning (5)
DHCP WARNING - Non-critical field invalid in response ;CM-MAC=;CMTS-MAC=;CM-QOS=1.0;CM-VER=3.0;

Time Not Established
Notice (6)
Honoring MDD; IP provisioning mode = IPv4

Mon Dec 31 15:16:54 2018
Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;

Mon Dec 31 15:15:29 2018
Critical (3)
SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=;CMTS-MAC=;CM-QOS=1.0;CM-VER=3.0;

Here are the signals.

Status

The statuses listed show the connection state of the cable modem. They are used by your service provider to evaluate the operation of the cable modem.

Startup Procedure

Procedure
Status
Comment

Acquire Downstream Channel
&nbsp;
Locked

Connectivity State
OK
Operational

Boot State
OK
Operational

Configuration File
OK

Security
Enabled
BPI+

DOCSIS Network Access Enabled
Allowed

Downstream Bonded Channels

Channel
Lock Status
Modulation
Channel ID
Frequency
Power
SNR
Corrected
Uncorrectables

1
Locked
QAM256
2
789000000 Hz
-5.9 dBmV
40.0 dB
368
85

2
Locked
QAM256
1
783000000 Hz
-6.7 dBmV
39.9 dB
7351
26263

3
Locked
QAM256
3
795000000 Hz
-7.0 dBmV
39.7 dB
367
196

4
Locked
QAM256
4
801000000 Hz
-8.7 dBmV
39.3 dB
363
39

5
Locked
QAM256
5
807000000 Hz
-8.4 dBmV
39.3 dB
434
364

6
Locked
QAM256
6
813000000 Hz
-7.3 dBmV
39.6 dB
291
45

7
Locked
QAM256
7
819000000 Hz
-6.8 dBmV
39.8 dB
298
31

8
Locked
QAM256
8
825000000 Hz
-7.2 dBmV
39.7 dB
235
62

9
Locked
QAM256
17
879000000 Hz
-8.2 dBmV
39.3 dB
268
28

10
Locked
QAM256
18
885000000 Hz
-8.1 dBmV
39.5 dB
295
33

11
Locked
QAM256
19
891000000 Hz
-9.2 dBmV
39.3 dB
186
14

12
Locked
QAM256
20
897000000 Hz
-9.7 dBmV
39.2 dB
248
18

13
Locked
QAM256
21
903000000 Hz
-9.4 dBmV
39.3 dB
18132
17011

14
Locked
QAM256
22
909000000 Hz
-9.9 dBmV
39.0 dB
36864
41259

15
Locked
QAM256
23
915000000 Hz
-10.5 dBmV
38.8 dB
861
3040

16
Locked
QAM256
24
921000000 Hz
-10.2 dBmV
38.9 dB
1005
3666

Upstream Bonded Channels

Channel
Lock Status
US Channel Type
Channel ID
Symbol Rate
Frequency
Power

1
Locked
ATDMA
2
5120 Ksym/sec
23500000 Hz
44.5 dBmV

2
Locked
ATDMA
1
5120 Ksym/sec
16900000 Hz
44.4 dBmV

3
Locked
ATDMA
3
5120 Ksym/sec
29900000 Hz
45.9 dBmV

4
Locked
ATDMA
4
5120 Ksym/sec
36300000 Hz
46.5 dBmV

bruce · Answer

Your specs look good.&nbsp; Cox recommended replacing your previous SB6141 because it only supported 8 down channels.&nbsp; Your new modem is obviously using 16.&nbsp; Are wired connections dropping?

xlnlif · Answer

Thanks for the reply, Bruce.&nbsp; Indeed all wired connections are dropping as well.&nbsp; I suspect my router as the modem lights look good and the modem replacement didn't appear to change anything. It has been a stable router so I was surprised that 4 years I have to replace it.&nbsp; I am using a new cat cable linking the router to the modem as I suspected that could have been the issue.&nbsp;
Unfortunately, as we are using the lower tier internet the 16x4 didn't change down/up speeds but if we upgrade, we're ready to go.&nbsp;

bruce · Answer

Well, you don't know if your speeds improved because something is not right.
A 4-year-old router is too young to die.&nbsp; You already have a new router in the mail, so why not reset your current router.&nbsp; Not reboot but reset to factory defaults.&nbsp; New Cat cable?&nbsp; Cat what?

bruce · Answer

Also, any new tech gear connected since Christmas?

xlnlif · Answer

Cat5 (patch cable that came with the modem). I've yet to factory reset my router so I'll try that as unplugging it fixes it only temporarily.&nbsp;&nbsp;
Yeah, some new gear.&nbsp; A Nintendo&nbsp;Switch and a laptop but neither were active during the outages.

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Internet is not stable - Cox recommended replacing modem still having issues

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Time	Priority	Description
Wed Jan 02 01:24:35 2019	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
Wed Jan 02 01:23:48 2019	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
Time Not Established	Warning (5)	DHCP WARNING - Non-critical field invalid in response ;CM-MAC=;CMTS-MAC=;CM-QOS=1.0;CM-VER=3.0;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv4
Mon Dec 31 15:16:54 2018	Critical (3)	Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.0;
Mon Dec 31 15:15:29 2018	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=;CMTS-MAC=;CM-QOS=1.0;CM-VER=3.0;

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

Downstream Bonded Channels
Channel	Lock Status	Modulation	Channel ID	Frequency	Power	SNR	Corrected	Uncorrectables
1	Locked	QAM256	2	789000000 Hz	-5.9 dBmV	40.0 dB	368	85
2	Locked	QAM256	1	783000000 Hz	-6.7 dBmV	39.9 dB	7351	26263
3	Locked	QAM256	3	795000000 Hz	-7.0 dBmV	39.7 dB	367	196
4	Locked	QAM256	4	801000000 Hz	-8.7 dBmV	39.3 dB	363	39
5	Locked	QAM256	5	807000000 Hz	-8.4 dBmV	39.3 dB	434	364
6	Locked	QAM256	6	813000000 Hz	-7.3 dBmV	39.6 dB	291	45
7	Locked	QAM256	7	819000000 Hz	-6.8 dBmV	39.8 dB	298	31
8	Locked	QAM256	8	825000000 Hz	-7.2 dBmV	39.7 dB	235	62
9	Locked	QAM256	17	879000000 Hz	-8.2 dBmV	39.3 dB	268	28
10	Locked	QAM256	18	885000000 Hz	-8.1 dBmV	39.5 dB	295	33
11	Locked	QAM256	19	891000000 Hz	-9.2 dBmV	39.3 dB	186	14
12	Locked	QAM256	20	897000000 Hz	-9.7 dBmV	39.2 dB	248	18
13	Locked	QAM256	21	903000000 Hz	-9.4 dBmV	39.3 dB	18132	17011
14	Locked	QAM256	22	909000000 Hz	-9.9 dBmV	39.0 dB	36864	41259
15	Locked	QAM256	23	915000000 Hz	-10.5 dBmV	38.8 dB	861	3040
16	Locked	QAM256	24	921000000 Hz	-10.2 dBmV	38.9 dB	1005	3666

Upstream Bonded Channels
Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	2	5120 Ksym/sec	23500000 Hz	44.5 dBmV
2	Locked	ATDMA	1	5120 Ksym/sec	16900000 Hz	44.4 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	29900000 Hz	45.9 dBmV
4	Locked	ATDMA	4	5120 Ksym/sec	36300000 Hz	46.5 dBmV