My speed is extremely slow - started 2 weeks ago. The T3 Timeouts

[M1keq]

Hi,

I have Xfinity 200Mb/ps Internet. It's more than 2 weeks  that my internet speed is extremely low. I can't stream from Disney Chanel anymore (video stops time to time) and prime video quality is really low. Yeah... I spent 4k for the TV and video quality is like 720p... :)))

Test results:

• I use only wire connection directly to my Modem. CM500-100NAS
• I run an Xfinity Speed test on different locations (Servers near my location). For some locations  I have 3 Mb/ps  and for others - it is 35mb/ps.  It's just unstable. I can't find any pattern. 
• I have only internet at home (No TV or other devices). My tests are directly to modem. 
• I run the test on a different harware and I have the same issue (Windows, Linux, FreeBSD).
• I run another test at fast.com (Powered by Netflix) and I have full 200mb/ps speed
• When I contact to support team they are doing the Modem Power Cycle but still the same problem. They told me that they see the noice  but because of the Covid-19 Virus, no one can visit my apartment right now.
• I've seen modem logs and almost every milliseconds I have T3 timeouts. it's all the time during the day, all the time:

2020-5-8, 14:04:15	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:04:14	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:04:14	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:04:14	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:04:14	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:04:14	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:04:14	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:04:14	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:04:14	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:53	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:52	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:52	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:52	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:52	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:52	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:52	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:52	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:52	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:31	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:30	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:30	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:30	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:30	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:30	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:30	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:30	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:30	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:09	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:08	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:08	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:08	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:08	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 2;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:08	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:08	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:08	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:03:08	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:02:47	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:02:45	Critical (3)	16 consecutive T3 timeouts while trying to range on upstream channel 3;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:02:45	Critical (3)	Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;
2020-5-8, 14:02:45	Critical (3)	Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=3c:37:86:37:99:c8;CMTS-MAC=00:01:5c:75:42:64;CM-QOS=1.1;CM-VER=3.0;

I don't know what to do. I ordered new modem and waiting for the delivery - but I'm not sure can the T3 timeout be caused by the modem? Any ideas what can I do?  

And my modem status is the following:

Frequency start Value

This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.

Starting Frequency: [0]

Startup Procedure

Procedure Status Comment Acquire Downstream Channel 429000000 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 1 429000000 Hz 4.9 dBmV 41.9 dB 0 0 2 Locked QAM256 2 435000000 Hz 4.7 dBmV 41.8 dB 0 0 3 Locked QAM256 3 441000000 Hz 5 dBmV 41.7 dB 0 0 4 Locked QAM256 4 447000000 Hz 5 dBmV 41.5 dB 0 0 5 Locked QAM256 5 453000000 Hz 4.8 dBmV 41.5 dB 0 0 6 Locked QAM256 6 459000000 Hz 5 dBmV 41.5 dB 0 0 7 Locked QAM256 7 465000000 Hz 5.4 dBmV 41.7 dB 0 0 8 Locked QAM256 8 471000000 Hz 5.7 dBmV 41.7 dB 0 0 9 Locked QAM256 9 477000000 Hz 6.1 dBmV 41.5 dB 0 0 10 Locked QAM256 10 483000000 Hz 6 dBmV 41.7 dB 0 0 11 Locked QAM256 11 489000000 Hz 5.4 dBmV 41.5 dB 0 0 12 Locked QAM256 12 495000000 Hz 5.4 dBmV 41.5 dB 0 0 13 Locked QAM256 13 519000000 Hz 5.2 dBmV 41.2 dB 0 0 14 Locked QAM256 14 525000000 Hz 4.9 dBmV 41 dB 0 0 15 Locked QAM256 15 531000000 Hz 4.5 dBmV 40.9 dB 0 0 16 Locked QAM256 16 537000000 Hz 4.9 dBmV 40.9 dB 0 0

Upstream Bonded Channels (Partial Service)

Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 85 5120 Ksym/sec 36500000 Hz 46.8 dBmV 2 Not Locked Unknown 86 0 Ksym/sec 30100000 Hz 0.0 dBmV 3 Not Locked Unknown 87 0 Ksym/sec 23700000 Hz 0.0 dBmV 4 Not Locked Unknown 88 0 Ksym/sec 17300000 Hz 0.0 dBmV

Extended Upstream Transmit Power

(Enabled , Checkbox deactivated)

[girlcomputes]

The difference with ours is the dBmV here is about 45