Intermittent "No Ranging Response received - T3 time-out"

[anitsuj]

Hi. I've been experiencing intermittent internet disconnection issues over the last few weeks (about as long as I've had Comcast at this address :/). Basically, whether its a wired connection or a WiFi connection, it seems as if our modem just stops talking to the internet. Sometimes for less than a minute, sometimes for 10 minutes at a time. It is massively impeding us from working at home, like many others are, due to the pandemic. Additionally, there is an issue with our Flex streaming device. Everytime it restarts, it just hangs at the "Welcome" screen, and eventually recommeneds retarting to resolve the issue.

There is a tech scheduled to come out tomorrow, but I was wondering if there was anything I should specifically ask them to check, or if there was anything else that has to be done/can be done remotely to mitigate this.

Hardware: ARRIS Surfboard (SBG10)

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Date Time	Event ID	Event Level	Description
3/20/2020 15:00	82000200	3	No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:00	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:01	84000500	3	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:01	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:13	84000500	3	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:13	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:14	84000500	3	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:14	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:18	82000200	3	No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:19	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:24	84000500	3	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 15:24	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 16:10	84000500	3	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 16:10	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 16:11	84000500	3	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 16:11	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 17:11	82000200	3	No Ranging Response received - T3 time-out;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 17:11	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 17:13	84000500	3	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;
3/20/2020 17:13	84000700	5	RCS Partial Service;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.0;

Downstream

	DCID	Freq	Power	SNR	Modulation	Octets	Correcteds	Uncorrectables
Downstream 1	25	579.00 MHz	10.00 dBmV	40.37 dB	256QAM	110058417	309957	490879
Downstream 2	26	585.00 MHz	9.80 dBmV	38.98 dB	256QAM	128522444	311625	514700
Downstream 3	27	591.00 MHz	9.30 dBmV	40.95 dB	256QAM	129771053	306999	524986
Downstream 4	28	597.00 MHz	9.10 dBmV	38.98 dB	256QAM	129642909	313486	525373
Downstream 5	29	603.00 MHz	9.00 dBmV	38.98 dB	256QAM	100480692	348379	557071
Downstream 6	30	609.00 MHz	8.70 dBmV	38.61 dB	256QAM	143570093	355195	566398
Downstream 7	31	615.00 MHz	8.30 dBmV	38.98 dB	256QAM	145329893	356554	583687
Downstream 8	32	621.00 MHz	8.40 dBmV	38.61 dB	256QAM	145267301	379489	597772
Downstream 9	33	627.00 MHz	8.00 dBmV	38.61 dB	256QAM	107163533	385765	628830
Downstream 10	34	633.00 MHz	7.50 dBmV	38.98 dB	256QAM	162199636	372930	611275
Downstream 11	35	639.00 MHz	7.40 dBmV	38.61 dB	256QAM	162055835	419745	670925
Downstream 12	36	645.00 MHz	7.60 dBmV	38.61 dB	256QAM	162512395	392602	638849
Downstream 13	37	651.00 MHz	8.00 dBmV	38.61 dB	256QAM	113051899	409337	655299
Downstream 14	38	657.00 MHz	7.40 dBmV	38.61 dB	256QAM	175362631	416894	689419
Downstream 15	39	663.00 MHz	7.40 dBmV	38.98 dB	256QAM	175705226	425779	681635
Downstream 16	40	669.00 MHz	7.30 dBmV	38.61 dB	256QAM	175289710	428102	687337

Upstream

	UCID	Freq	Power	Channel Type	Symbol Rate	Modulation
Upstream 1	7	23.00 MHz	37.75 dBmV	DOCSIS2.0 (ATDMA)	5120 kSym/s	64QAM
Upstream 2	8	16.60 MHz	37.75 dBmV	DOCSIS2.0 (ATDMA)	5120 kSym/s	64QAM
Upstream 3	6	29.40 MHz	39.25 dBmV	DOCSIS2.0 (ATDMA)	5120 kSym/s	64QAM
Upstream 4	5	35.80 MHz	39.25 dBmV	DOCSIS2.0 (ATDMA)	5120 kSym/s	64QAM

[anitsuj]

So the tech came out on Saturday, and replaced the coax between our node and our house. I think this helped mitigate the issue a bit, and the SNR is definitely better. But, it seems like there is still a lot of noise in the signal, because the intermittent drops are still happening due to loss of sync. The T3 time-outs are less frequent, but it seems like the losses of sync are not.