vadeltachi's profile

Contributor

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65 Messages

Friday, January 16th, 2026 1:09 AM

Continuing problems after headend update

We are still experiencing daily T3 errors and frequent streaming drops.

The headend was updated in November. Our modem was misconfigured, and it took weeks to get it properly provisioned.

However, we are not obtaining the bandwidth we are paying for (1.2G) and still have frequent streams dropping.

D/L bandwidth tested at the modem is consistently around 800-900 (was around 1300-1400 before) U/L is 25 - 35 (was 40-42 before).

Can someone please help and get the headend fixed?

There have been no changes at our location -- Same hardware, same cables, all of the fittings are tight, all of the firmware is updated, and everything is rebooted every day.

Still with T3 errors that were never present before the November headend update.

Arris S33 log:

The table below contains the log of events that the S33 has detected. This log can be important to the service provider to help diagnose and correct problems, if any should occur.

Date Time Event Level Description
31/12/1969
19:00:35
3 CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.
12/12/2025
08:32:00
3 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;
12/12/2025
08:33:53
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/12 at 8:33 AM.
13/12/2025
08:18:50
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/13 at 8:18 AM.
14/12/2025
07:42:10
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=3.1;
14/12/2025
08:29:12
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/14 at 8:29 AM.
15/12/2025
00:00:08
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=3.1;
15/12/2025
08:11:51
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/15 at 8:11 AM.
16/12/2025
06:56:49
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=3.1;
16/12/2025
07:45:25
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/16 at 7:45 AM.
17/12/2025
01:34:57
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=3.1;
17/12/2025
07:50:12
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/17 at 7:50 AM.
18/12/2025
00:13:17
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=3.1;
18/12/2025
02:39:52
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=3.1;
18/12/2025
08:20:57
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/18 at 8:20 AM.
19/12/2025
00:07:20
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=3.1;
19/12/2025
07:31:58
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/19 at 7:32 AM.
20/12/2025
07:32:54
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=3.1;
20/12/2025
08:41:23
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/20 at 8:41 AM.
20/12/2025
11:55:09
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=3.1;
21/12/2025
08:35:11
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/21 at 8:35 AM.
22/12/2025
05:40:38
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=3.1;
22/12/2025
07:57:20
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/22 at 7:57 AM.
22/12/2025
12:10:05
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=3.1;
23/12/2025
08:20:20
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/23 at 8:20 AM.
31/12/1969
19:00:16
3 CMSTATUS:US_Diplexer_Mode_Change:Init, 5-42MHz.
31/12/1969
19:00:21
3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
31/12/1969
19:00:21
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-21.2, 258MHz.
31/12/1969
19:00:21
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-21.3, 1002MHz.
31/12/1969
19:00:21
3 CMSTATUS:US_Diplexer_Mode_Change_Ignored:TLV-21.1, 42MHz.
31/12/1969
19:00:35
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.
31/12/1969
19:00:35
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.
31/12/1969
19:00:35
3 CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.
24/12/2025
08:00:57
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/24 at 8:00 AM.
25/12/2025
08:36:07
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/25 at 8:36 AM.
25/12/2025
08:42:01
3 Failed LAN WebGUI login attempt from 69.251.98.60 on 25/12/25 at 8:42 AM.
25/12/2025
08:42:10
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/25 at 8:42 AM.
25/12/2025
08:48:24
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/25 at 8:48 AM.
26/12/2025
07:49:58
3 Failed LAN WebGUI login attempt from 69.251.98.60 on 25/12/26 at 7:49 AM.
26/12/2025
07:50:06
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/26 at 7:50 AM.
26/12/2025
21:20:08
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=3.1;
27/12/2025
08:23:44
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/27 at 8:23 AM.
27/12/2025
15:10:52
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=3.1;
28/12/2025
08:15:57
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/28 at 8:15 AM.
29/12/2025
08:36:18
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/29 at 8:36 AM.
29/12/2025
22:22:22
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=3.1;
30/12/2025
08:14:18
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/30 at 8:14 AM.
31/12/2025
00:09:08
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=3.1;
31/12/2025
07:54:26
3 Successful LAN WebGUI login from 69.251.98.60 on 25/12/31 at 7:54 AM.
31/12/2025
21:16:44
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=3.1;
1/1/2026
07:50:57
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/01 at 7:50 AM.
2/1/2026
03:40:47
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=3.1;
2/1/2026
08:41:52
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/02 at 8:41 AM.
31/12/1969
19:00:15
3 CMSTATUS:US_Diplexer_Mode_Change:Init, 5-42MHz.
31/12/1969
19:00:18
3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
31/12/1969
19:00:19
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-21.2, 258MHz.
31/12/1969
19:00:19
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-21.3, 1002MHz.
31/12/1969
19:00:19
3 CMSTATUS:US_Diplexer_Mode_Change_Ignored:TLV-21.1, 42MHz.
31/12/1969
19:00:33
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.
31/12/1969
19:00:33
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.
31/12/1969
19:00:33
3 CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.
3/1/2026
08:44:52
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/03 at 8:44 AM.
3/1/2026
10:28:25
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=3.1;
4/1/2026
08:39:22
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/04 at 8:39 AM.
5/1/2026
07:37:25
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=3.1;
5/1/2026
07:53:34
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/05 at 7:53 AM.
5/1/2026
20:35:57
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=3.1;
6/1/2026
08:20:53
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/06 at 8:20 AM.
6/1/2026
09:35:46
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=3.1;
7/1/2026
08:55:05
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/07 at 8:55 AM.
8/1/2026
08:26:22
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/08 at 8:26 AM.
8/1/2026
21:56:22
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=3.1;
9/1/2026
08:08:45
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/09 at 8:08 AM.
9/1/2026
16:02:40
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=3.1;
10/1/2026
09:10:22
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/10 at 9:10 AM.
31/12/1969
19:00:15
3 CMSTATUS:US_Diplexer_Mode_Change:Init, 5-42MHz.
31/12/1969
19:00:20
3 SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
31/12/1969
19:00:22
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-21.2, 258MHz.
31/12/1969
19:00:22
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-21.3, 1002MHz.
31/12/1969
19:00:22
3 CMSTATUS:US_Diplexer_Mode_Change_Ignored:TLV-21.1, 42MHz.
31/12/1969
19:00:27
6 Honoring MDD; IP provisioning mode = IPv6
31/12/1969
19:00:36
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.2, 108MHz.
31/12/1969
19:00:36
3 CMSTATUS:DS_Diplexer_Mode_Change_Ignored:TLV-84.3, 1002MHz.
31/12/1969
19:00:36
3 CMSTATUS:US_Diplexer_Mode_Change:TLV-84.1, 5-42MHz.
10/1/2026
09:20:24
6 DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;
10/1/2026
09:21:05
3 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;
11/1/2026
09:09:31
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=3.1;
11/1/2026
09:21:27
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/11 at 9:21 AM.
12/1/2026
08:21:11
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=3.1;
12/1/2026
08:23:43
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/12 at 8:23 AM.
12/1/2026
18:13:35
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=3.1;
12/1/2026
20:17:51
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/12 at 8:17 PM.
13/1/2026
06:40:00
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=3.1;
13/1/2026
08:27:03
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/13 at 8:27 AM.
14/1/2026
05:55:24
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=3.1;
14/1/2026
08:16:04
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/14 at 8:16 AM.
14/1/2026
22:53:39
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=3.1;
15/1/2026
08:27:23
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/15 at 8:27 AM.
15/1/2026
12:03:07
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=3.1;
15/1/2026
20:00:20
3 Successful LAN WebGUI login from 69.251.98.60 on 26/01/15 at 8:00 PM.
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Official Employee

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424 Messages

16 days ago

Thanks for stopping by our community forums, vadeltachi! Sorry to hear you aren't receiving the full speed included with your plan. Our team would be more than happy to take a closer look! Please send us a direct message with your full name, name on the account (if different), and service address, and we'll get started.

To send a direct message, please click on the chat icon in the top-right corner of the screen, and select "Xfinity Support" to initiate a live chat. 

• Click "Sign In" if necessary

• Click the "direct messaging" icon or https://comca.st/3J0ir1l

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

• Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line

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

• Press Enter to send

Expert

 • 

115.7K Messages

15 days ago

@vadeltachi @XfinitySean 

Please circle back here and post any possible solutions for the issue here in these open public 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.

Contributor

 • 

65 Messages

After much back and forth, we have a better understanding of where the issue(s) likely lie.

As I have been saying from the beginning of this so-called "upgrade," all of the issues occurred AFTER the planned outage and upgrade. So, it appears comcast bungled it and here we are.

It's not just me, and the symptoms are the same. T3 errors and dropped streams among others as reported below:

Reports from  , indicate ongoing Comcast (Xfinity) internet instability beginning in November 2025 and continuing into January 2026.
Reported Issues and Causes
  • Infrastructure Upgrades: Neighborhoods in Reston reported constant outages (dropping every 30 minutes) starting around November 18, 2025, following local network work. Technicians reportedly attributed these failures to faulty components in new infrastructure upgrades.
  • Frequent Connectivity Drops: Users have documented frequent service interruptions that last several minutes or hours, severely impacting those working from home or using video conferencing tools.
  • Persistent Regional Outages: As recently as January 19, 2026, residents have continued to report service "going in and out" following recent network updates. 
Wider Regional Trends
  • State-Wide Network Upgrades: Throughout 2025, Comcast invested heavily in Virginia, specifically for "Next Generation Network" construction. This has led to "planned outages" during the day in multiple counties as they upgrade to symmetrical upload and download speeds.
  • Legacy Equipment Failures: Reports from December 2025 suggest that older Xfinity hardware (modems and TV boxes) has struggled to handle these new network updates, causing localized failures in neighborhoods with older infrastructure. 
Actionable Steps for Neighbors
If you are outside Reston but experiencing these issues:
  1. Check the Regional Map: Use the Xfinity Outage Map to see if your specific neighborhood is undergoing "Next Generation Network" construction.
  2. Request a Hardware Audit: If neighbors are also experiencing drops, it may be a "plant problem" (faulty local pole hardware) that requires a neighborhood-wide dispatch rather than an individual home visit.
  3. Monitor for Text Alerts: You can text OUT to 266278 to get the most localized update for your specific address. 
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