Watching speeds, they have been completely erratic. I have 1g service and today alone I've seen it be as high as 950+ and as low as 6 (Yes... 6). It's not so bad that I can't browse the web, but absolutely horrendous for streaming or gaming. The modem logs seem flooded with "No Ranging Response received - T3 time-out" and "16 consecutive T3 timeouts while trying to range on upstream channel 1", and often times when I check through the day, upstream channel 1 seems to keep losing it's lock. Nothing physical has changed in my setup, at least inside the house. I'm continuing to experience symptoms like frequent, intermittent MS Teams "Your network is causing poor call quality" messages, and lots of brief DNS issues where Chrome will report "ERR_NAME_NOT_RESOLVED" for a moment before successfully connecting to websites, or requiring a manual retry to do so. Constant T3 timeouts. Any update on this? Same thing happened to me, thought I was going crazy. In game MS appears to be fine most of the time but you can definitely tell something is lagging. 04-22-2020 SB8200 Log and Signals. I had Comcast come and check, they said the signal strength was good and the noise was low. 21:20:38 16 consecutive T3 timeouts while trying to range on - 4120861 Our community is your official source on Reddit for help with Xfinity services. Cookies help us deliver our Services. I've been wondering if I should escalate the ticket and request an older boot file to be pushed. Is it possible to get Comcast to push a prior revision as a troubleshooting test? Problem persists. Yesterday was 5-6 reboots. In the Upstream Bonded Channels section, identify the number of Channels and Type to find verify Upstream Power levels are within the acceptable range for each upstream channel. Every 6-7 minutes the xfinity-supplied router log shows: Wed Dec 21 19:41:25 2016 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:41:25 2016 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:41:25 2016 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:41:25 2016 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:41:25 2016 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:41:25 2016 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:41:19 2016 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:41:19 2016 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:41:19 2016 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:34:13 2016 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:34:13 2016 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:34:13 2016 Critical (3) Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:34:12 2016 Critical (3) 16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; Wed Dec 21 19:34:12 2016 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=58:23:8c:b4:46:d2;CMTS-MAC=00:01:5c:6b:80:57;CM-QOS=1.1;CM-VER=3.0; If I power cycle the router, it won't reconnect for a couple hours. The upstream LED was flashing green so I had a tech from ... 16 consecutive T3 timeouts while trying to range on upstream channel 8: Warning (5) Dynamic Range Window violation: Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW: Been gaming a lot more lately on it than normal and keep having weird bursts of bad lag. If you have questions about your services, we're here to answer them. This post was marked as a discussion by a moderator. My Setup (Cable 1Gbps/50Mbps)>CM1200 v2.02.03(LAG Disabled)>RBK853 v3.2.17.12. Be sure your using good quality RG6 coax cable up to the modem. CM-STATUS message sent. Welcome to the Xfinity community! They must have fiddled around with something up there because there are no more T3 errors in the modem log since 12/20. Warning (5) Dynamic Range Window violation, Startup Procedure Procedure Status Comment Acquire Downstream Channel 693000000 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 15 693000000 Hz 0.9 dBmV 39.4 dB 0 0 2 Locked QAM256 2 615000000 Hz 2.4 dBmV 40.2 dB 0 0 3 Locked QAM256 3 621000000 Hz 2.4 dBmV 40.2 dB 0 0 4 Locked QAM256 4 627000000 Hz 2.4 dBmV 40.2 dB 0 0 5 Locked QAM256 5 633000000 Hz 2.4 dBmV 39.3 dB 0 0 6 Locked QAM256 6 639000000 Hz 2.2 dBmV 39.7 dB 0 0 7 Locked QAM256 7 645000000 Hz 2.2 dBmV 40.2 dB 0 0 8 Locked QAM256 9 657000000 Hz 1.6 dBmV 38.8 dB 0 0 9 Locked QAM256 14 687000000 Hz 1 dBmV 39.2 dB 0 0 10 Locked QAM256 18 711000000 Hz -0.2 dBmV 38.8 dB 0 0 11 Locked QAM256 19 717000000 Hz -0.5 dBmV 38.5 dB 1 0 12 Locked QAM256 20 723000000 Hz -1 dBmV 38.1 dB 0 0 13 Locked QAM256 21 729000000 Hz -1.1 dBmV 38 dB 1 0 14 Locked QAM256 22 735000000 Hz -0.9 dBmV 38.1 dB 1 0 15 Locked QAM256 23 741000000 Hz -0.5 dBmV 38.3 dB 0 0 16 Locked QAM256 24 747000000 Hz -0.3 dBmV 38.4 dB 0 0, Upstream Bonded Channels (Partial Service) Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 1 5120 Ksym/sec 35800000 Hz 41.8 dBmV 2 Not Locked Unknown 2 0 Ksym/sec 29400000 Hz 0.0 dBmV 3 Not Locked Unknown 3 0 Ksym/sec 23000000 Hz 0.0 dBmV 4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV. 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