Xfinity ISP error codes on modem

My modem intermittently drops the internet connection and logs error codes. I have contacted Xfinity 3 times already. They have failed to correct this issue. I have replaced my Modem and Router already. All wires are correctly plugged in. Device has been rebooted. Has been interrogated by Xfinity.

I already spoke to a "supervisor" at Xfinity who said there was an issue on Xfinity's end, but didn't fix the issue. Xfinity needs to fix this or I am going to have to change providers. The most recent error logs are listed below.

05/12/2025 09:16:08	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 20; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/12/2025 05:11:44	Critical	No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 21:59:24	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 20; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 21:59:03	Critical	No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 21:50:00	Notice	CM-STATUS message sent. Event Type Code: 23; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 21:47:51	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 20:56:25	Notice	CM-STATUS message sent. Event Type Code: 24; Chan ID: 194; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 20:54:41	Notice	CM-STATUS message sent. Event Type Code: 23; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 20:50:22	Notice	CM-STATUS message sent. Event Type Code: 17; Chan ID: 36; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 20:50:11	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 20:09:54	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 36; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 20:09:48	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 20:09:29	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 28; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:47:36	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 28; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:47:19	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:46:52	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 22; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:46:06	Warning	Lost MDD Timeout;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:46:05	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:37:25	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 44; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:31:55	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 44; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:31:49	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:20:57	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 44; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:20:51	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:06:38	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 44; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 19:06:23	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 18:59:00	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 44; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 18:58:56	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 18:57:05	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 44; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 18:55:18	Critical	No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 18:51:48	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 44; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 18:35:23	Critical	No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 18:20:52	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 44; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 17:56:32	Critical	No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 17:54:05	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 20; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 17:53:56	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 17:38:27	Critical	No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:18:28	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 20; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:18:15	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:07:16	Notice	CM-STATUS message sent. Event Type Code: 24; Chan ID: 194; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:03:49	Notice	CM-STATUS message sent. Event Type Code: 23; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:03:30	Warning	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:03:21	Notice	CM-STATUS message sent. Event Type Code: 17; Chan ID: 28; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:03:17	Warning	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:03:14	Notice	CM-STATUS message sent. Event Type Code: 4; Chan ID: 19; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:03:08	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:03:08	Error	TCS Fail on all Upstream Channels;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:03:08	Critical	No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 09:02:58	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 08:54:27	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 44; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 08:54:04	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 08:49:02	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 20; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 08:27:16	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 20; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 08:27:12	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 08:27:10	Notice	CM-STATUS message sent. Event Type Code: 2; Chan ID: 28; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 08:27:09	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 07:48:42	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 31; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 03:43:58	Critical	No Ranging Response received - T3 time-out;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 03:41:31	Notice	CM-STATUS message sent. Event Type Code: 24; Chan ID: 194; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 03:40:07	Notice	CM-STATUS message sent. Event Type Code: 23; Chan ID: 193; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 03:35:46	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 31; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 03:35:21	Critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
05/11/2025 03:35:15	Notice	CM-STATUS message sent. Event Type Code: 5; Chan ID: 18; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;

Responses

XfinityArmand

Official Employee

•

2.1K Messages

22 hours ago

Hello @user_8t4x6o and thank you so much for taking the time to reach out to Xfinity Support! We are so glad to hear from you and want to help in any way that we can to ensure that you are having the best experience with your service. No worries! You have reached out to the best team to assist in addressing your service concerns. Please feel free to shoot us a private message with your details so that we can get started.

To send a "direct message" / "private message" message to Xfinity Support:

• Click "Sign In" if necessary

• Click the "Direct Message" icon or https://forums.xfinity.com/direct-messaging

• Click the "New message" (pencil and paper) icon

• The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there

• As you are typing a drop-down list appears. Select "Xfinity Support" from that list

• An "Xfinity Support" graphic replaces the "To:" line

• Type your message in the text area near the bottom of the window

• Press Enter to send it

(edited)

EG

Expert

•

110.3K Messages

17 hours ago

What do the modem's signal status values look like ?

Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.

Customer Service

user_8t4x6o

Xfinity ISP error codes on modem

XfinityArmand

EG

New to the Community?