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dreamielee
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Monday, June 15th, 2026 5:09 AM

my modem/router is generating repeated T3 timeouts and MDD message timeouts

This has been happening for about 8 months. High ping spikes(300-1000+ms), packet lost while gaming. I had an ARRIS SBG10 modem/router combo that was maybe half a year old and I figured maybe that was the issue, So I bought a netgear nighthawk ac1900, and the issues persist. I bought a better coax cable and it was still the same. A tech came here and replaced the outside/wall wiring and nothing seem to fix this issue. They did mention that my modem/router wasn't connected even though I was receiving internet. They called in for me and connected it, even thought i already did it through the phone app.

Current Cable Modem is: Netgear Nighthawk AC1900

EVENT LOG:

2026-6-14, 23:43:54

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 23:43:35

Critical (3)

SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 23:08:52

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 23:08:47

Critical (3)

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 23:08:02

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 23:08:01

Critical (3)

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 23:01:20

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 23:01:14

Critical (3)

SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 23:00:29

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:59:41

Critical (3)

SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:54:32

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:54:23

Critical (3)

SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:53:32

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:53:21

Critical (3)

SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:17:21

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:17:19

Critical (3)

SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:16:02

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:15:54

Critical (3)

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:10:55

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:10:52

Critical (3)

SYNC Timing Synchronization failure - Failed to receive MAC SYNC frame within time-out period;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;

2026-6-14, 22:09:06

Warning (5)

MDD message timeout;CM-MAC=[Edited: “Personal Information”];CMTS-MAC=[Edited: “Personal Information”];CM-QOS=1.1;CM-VER=3.0;


It does this all day long.

CABLE CONNECTION: (i reset my modem about 5 hours ago)

Startup Procedure

Procedure

Status

Comment

Acquire Downstream Channel

627000000 Hz

Locked

Connectivity State

OK

Operational

Boot State

OK

Operational

Security

Enabled

BPI+

IP Provisioning Mode

Honor MDD

honorMdd(4)

 

Downstream Bonded Channels

Channel

Lock Status

Modulation

Channel ID

Frequency

Power

SNR

Correctables

Uncorrectables

1

Locked

QAM256

29

627000000 Hz

3.8 dBmV

31.9 dB

10637515

5559591

2

Locked

QAM256

13

531000000 Hz

4.3 dBmV

40.2 dB

0

0

3

Locked

QAM256

14

537000000 Hz

4.1 dBmV

40.4 dB

0

0

4

Locked

QAM256

15

543000000 Hz

4.3 dBmV

40.8 dB

0

0

5

Locked

QAM256

16

549000000 Hz

4.6 dBmV

40.9 dB

0

0

6

Locked

QAM256

17

555000000 Hz

4.5 dBmV

40.9 dB

0

0

7

Locked

QAM256

18

561000000 Hz

4 dBmV

40 dB

0

0

8

Locked

QAM256

19

567000000 Hz

4.9 dBmV

41.1 dB

0

0

9

Locked

QAM256

20

573000000 Hz

4.6 dBmV

40.7 dB

0

0

10

Locked

QAM256

21

579000000 Hz

4.3 dBmV

39.9 dB

2

0

11

Locked

QAM256

22

585000000 Hz

4.7 dBmV

40.6 dB

0

0

12

Locked

QAM256

23

591000000 Hz

4.1 dBmV

40.2 dB

2

0

13

Locked

QAM256

24

597000000 Hz

3.7 dBmV

40.1 dB

2

0

14

Locked

QAM256

25

603000000 Hz

4.2 dBmV

40.3 dB

1

0

15

Locked

QAM256

26

609000000 Hz

3.8 dBmV

40 dB

3

0

16

Locked

QAM256

27

615000000 Hz

3.5 dBmV

40.2 dB

3

0

17

Locked

QAM256

28

621000000 Hz

3.3 dBmV

39 dB

0

0

18

Locked

QAM256

30

633000000 Hz

2.8 dBmV

29.9 dB

0

0

19

Locked

QAM256

31

639000000 Hz

3.2 dBmV

32.7 dB

0

0

20

Locked

QAM256

32

645000000 Hz

2.7 dBmV

40.3 dB

0

0

21

Locked

QAM256

33

651000000 Hz

2.6 dBmV

39.9 dB

0

0

22

Locked

QAM256

34

657000000 Hz

2.7 dBmV

40.1 dB

0

0

23

Locked

QAM256

35

663000000 Hz

2.5 dBmV

39.9 dB

0

0

24

Locked

QAM256

36

669000000 Hz

2.1 dBmV

39.4 dB

0

0

 

Upstream Bonded Channels

Channel

Lock Status

US Channel Type

Channel ID

Symbol Rate

Frequency

Power

1

Locked

ATDMA

2

5120 Ksym/sec

16400000 Hz

46.3 dBmV

2

Locked

ATDMA

5

5120 Ksym/sec

35600000 Hz

44.5 dBmV

3

Locked

ATDMA

3

5120 Ksym/sec

22800000 Hz

45.3 dBmV

4

Locked

ATDMA

4

5120 Ksym/sec

29200000 Hz

45.5 dBmV

5

Locked

ATDMA

6

2560 Ksym/sec

40400000 Hz

44.8 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

 

Question

 • 

Updated 

11 hours ago

 • Edited

4

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