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wbm1991
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Saturday, October 28th, 2023 4:45 PM

Closed

Motorola Modem MB8600 Connection Drops/Timing Issues

Hello,

I hope to find a resolution to an issue I've been having for the last couple of weeks. My modem (Motorola MB8600) will have a service drop, leading to my router disconnecting and staying disconnected from the internet until I restart my modem. It does this several (and I mean several) times throughout the day. I wake up in the morning to no wifi and get home from work and have no wifi, even though the modem seems to be working correctly (all lights are on/solid blue except for the LAN/ethernet light which is blinking green).

I have tried everything I can think of:

  • factory reset of both my modem and router (TP-Link Deco X55)
  • made sure all cables were/are securely connected
  • reactivated the modem on my account through Xfinity's website
  • flushed the MAC address from the modem and reconnected the router
  • simple rebooting of both the modem and router

However, none of these have worked more than me intermittently regaining internet. I have posted the event logs and connection information from the modem. If anyone can offer any guidance, I will be eternally grateful.

Warm regards,

Blake

----

Modem Event Log:

Event Log

 


  

   

Time 

 

Priority 

 

Description 

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:Fixed Initial, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-9, 5-42MHz.

   

Time Not Established

 

Critical (3)

 

No Ranging Response received - T3 time-out;

   

Time Not Established

 

Notice (6)

 

Honoring MDD; IP provisioning mode = IPv6

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.

   

Time Not Established

 

Critical (3)

 

CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.

   

09:37:54
Sat Oct 28 2023

 

Notice (6)

 

DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;

Modem Connection Stats:

Connection

   Startup Sequence

 

 

   Startup Step

Status

Comment



  

   Acquire Downstream Channel

507000000 Hz

Locked


  

   Upstream Connection

OK

Operational


  

   Boot State

OK

Operational



  

   Configuration File

OK


  

   Security

Enabled

BPI+


  

 

   Connection Status

 

 

   System Up Time

0 days 00h:42m:42s

 


  

   Network Access

Allowed

 


  

 

   Downstream Bonded Channels

 


  

   Channel

Lock Status

Modulation

Channel ID

Freq. (MHz)

Pwr (dBmV)

SNR (dB)

Corrected

Uncorrected

   1

Locked

QAM256

9

507.0

6.5

42.9

0

0

   2

Locked

QAM256

1

453.0

5.8

42.1

0

0

   3

Locked

QAM256

2

459.0

6.4

42.5

0

0

   4

Locked

QAM256

3

465.0

6.5

42.8

0

0

   5

Locked

QAM256

4

471.0

6.4

42.7

0

0

   6

Locked

QAM256

5

477.0

6.4

42.8

0

0

   7

Locked

QAM256

6

483.0

6.2

42.7

0

0

   8

Locked

QAM256

7

489.0

6.3

42.8

0

0

   9

Locked

QAM256

8

495.0

6.2

42.6

0

0

   10

Locked

QAM256

10

513.0

6.5

42.9

0

0

   11

Locked

QAM256

11

519.0

6.6

43.1

0

0

   12

Locked

QAM256

12

525.0

6.6

43.0

0

0

   13

Locked

QAM256

13

531.0

6.6

42.9

0

0

   14

Locked

QAM256

14

537.0

6.5

42.8

0

0

   15

Locked

QAM256

15

543.0

6.4

42.8

0

0

   16

Locked

QAM256

16

549.0

6.2

42.8

0

0

   17

Locked

QAM256

17

555.0

6.5

42.9

0

0

   18

Locked

QAM256

18

561.0

6.5

42.9

0

0

   19

Locked

QAM256

19

567.0

6.8

42.9

0

0

   20

Locked

QAM256

20

573.0

7.4

43.1

0

0

   21

Locked

QAM256

21

579.0

7.8

43.1

0

0

   22

Locked

QAM256

22

585.0

8.4

43.3

0

0

   23

Locked

QAM256

23

591.0

8.2

43.2

0

0

   24

Locked

OFDM PLC

37

690.0

7.6

42.8

37542117

0

   25

Locked

QAM256

38

429.0

6.2

42.7

0

0

   26

Locked

QAM256

39

435.0

6.1

42.7

0

0

   27

Locked

QAM256

40

441.0

5.9

42.5

0

0

   28

Locked

QAM256

41

447.0

5.6

42.2

0

0

   29

Locked

QAM256

42

405.0

5.9

42.8

0

0

   30

Locked

QAM256

43

411.0

6.2

42.8

0

0

   31

Locked

QAM256

44

417.0

6.2

42.8

0

0

   32

Locked

QAM256

45

423.0

6.3

42.8

0

0

 

   Upstream Bonded Channels

 


  

   Channel

Lock Status

Channel Type

Channel ID

Symb. Rate (Ksym/sec)

Freq. (MHz)

Pwr (dBmV)

   1

Locked

SC-QAM

1

2560

10.4

40.5

   2

Locked

SC-QAM

2

5120

16.4

41.0

   3

Locked

SC-QAM

3

5120

22.8

41.5

   4

Locked

SC-QAM

4

5120

29.2

42.3

   5

Locked

SC-QAM

5

5120

35.6

42.5

   6

Locked

SC-QAM

6

1280

39.6

42.5

Question

 • 

Updated 

1 year ago

 • Edited

881

4

XfinityBenjaminM

Official Employee

 • 

2.1K Messages

2 years ago

@wbm1991 Hello! Thank you for reaching out to us here on our Community Forum. We are sorry that you are having trouble with your connection and we can definitely see what is going on.

We see that you have sent us a Direct Message. Please remember that sending an unsolicited Direct Message to an official Xfinity Employee is a violation of our Community Forum Guidelines. We will reply to your DM. In the future, please make your public post and if we find that it is necessary to bring you into a Direct Message we will invite you to send us one.

1

0

wbm1991

Visitor

 • 

3 Messages

Apologies for not following the proper protocols; I will remember this for any future correspondence. However, thank you for your reply, and I look forward to working with you.  

2 years ago

0

EG

Expert

 • 

110.6K Messages

2 years ago

@wbm1991 @XfinityBenjaminM 

Please circle back here and post any possible solutions for the issue here in these open forums so that all readers here may benefit from the exchange / info. This is in keeping with the spirit for which these public help forums were originally intended. Thank you.

1

0

wbm1991

Visitor

 • 

3 Messages

@EG​ I sure will! Thank you! 

2 years ago

user_f4203e

Visitor

 • 

1 Message

2 years ago

I'm having very similar issues with my MB8600 and Xfinity. Like you, I've found that the problem lies with the modem, and it requires a power cycle every day or two once it crashes. I just reached out to Motorola, and will see what they say.

The modem is great when it's working, but this is really a pain. I feel like the problem began a few months back or so.

0

0

user_djuj90

1 Message

1 year ago

I'm having the same problem with my MB8600 and Xfinity. Did anyone find a long term solution to this?

0

0

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