Event Log with Continual - Started Unicast Maintenance Ranging - No Response received - T3 time-out

Hey All - I came home tonight to some unresponsive internet (<10mb down and 0.03 up) and when I checked on the event log, it had the dreaded "Started Unicast Maintenance Ranging - No Response received - T3 time-out" message occuring over & over.  After repeated power cycles, signal resends, etc., it would clear up for 10-15 minutes then back at little to no performance.  Four hours later of troubleshooting, I couldn't make any headway with phone tech support as I own the modem (that was the initial response of its the modem's fault).

 

In years past when this has occured, the only way I've gotten this straightened out after many calls & tech support visits was eventually getting new line drops.  Was wondering if there was any ideas on what how I can help point tech support in the right direction or talk to the team at Comcast to get this properly diagnosed as the base tech support can't see anything on their end.

 

After doing more reading tonight around the upstream & downstream levels, it looks like downstream power is a bit high across the board, but all else is in acceptable tolerances.  Any ideas on what I could do to try & get this straightened out (again) or anything that can be done on my own?

 

Downstream:

Channel	Lock Status	Modulation	Channel ID	Freq. (MHz)	Pwr (dBmV)	SNR (dB)	Corrected	Uncorrected
1	Locked	QAM256	17	621.0	9.3	40.4	0	0
2	Locked	QAM256	18	627.0	9.5	40.3	0	0
3	Locked	QAM256	19	633.0	9.8	40.4	0	0
4	Locked	QAM256	20	639.0	9.7	40.3	0	0
5	Locked	QAM256	21	645.0	9.6	40.4	0	0
6	Locked	QAM256	22	651.0	9.5	40.2	0	0
7	Locked	QAM256	23	657.0	9.6	40.2	1	0
8	Locked	QAM256	24	663.0	9.6	40.2	1	0
9	Locked	QAM256	25	669.0	9.8	40.2	0	0
10	Locked	QAM256	26	675.0	10.1	39.8	0	0
11	Locked	QAM256	27	681.0	10.4	40.2	0	0
12	Locked	QAM256	28	687.0	10.0	40.2	0	0
13	Locked	QAM256	29	693.0	10.0	40.1	1	0
14	Locked	QAM256	30	699.0	9.9	40.1	1	0
15	Locked	QAM256	31	705.0	9.8	40.0	0	0
16	Locked	QAM256	32	711.0	9.4	39.9	0	0
Total							4	0

 

Upstream:

Channel	Lock Status	Channel Type	Channel ID	Symb. Rate (Ksym/sec)	Freq. (MHz)	Pwr (dBmV)
1	Locked	ATDMA	4	5120	16.6	44.0
2	Locked	ATDMA	1	5120	35.8	45.8
3	Locked	ATDMA	2	5120	29.4	45.5
4	Locked	ATDMA	3	5120	23.0	45.3