SYNC Timing Synchronization failure

Afternoon all,

 

While it doesn't happen on any consistent basis, when it starts, it drops the internet several times throughout multiple days rendering the internet useless.  I have my own cable modem that is showing the following logs:

 

Time Not Established		Critical (3)		SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:4f:32:8e;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
	Time Not Established		Critical (3)		No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:32:8e;CMTS-MAC=00:01:5c:7a:0c:49;CM-QOS=1.1;CM-VER=3.1;
	Time Not Established		Critical (3)		SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=00:40:36:4f:32:8e;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
	Time Not Established		Critical (3)		No Ranging Response received - T3 time-out;CM-MAC=00:40:36:4f:32:8e;CMTS-MAC=00:01:5c:7a:0c:49;CM-QOS=1.1;CM-VER=3.1;

 

My power and signel to noise ratio - Downsteam:

 

Channel	Lock Status	Modulation	Channel ID	Freq. (MHz)	Pwr (dBmV)	SNR (dB)	Corrected	Uncorrected
1	Locked	QAM256	13	577.8	9.9	41.4	0	0
2	Locked	QAM256	1	505.8	8.1	40.6	0	0
3	Locked	QAM256	2	511.8	7.8	40.6	0	0
4	Locked	QAM256	3	517.8	7.6	40.7	0	0
5	Locked	QAM256	4	523.8	7.5	40.5	0	0
6	Locked	QAM256	5	529.8	7.5	40.7	0	0
7	Locked	QAM256	6	535.8	7.6	40.6	0	0
8	Locked	QAM256	7	541.8	7.8	41.0	0	0
9	Locked	QAM256	8	547.8	8.2	41.1	0	0
10	Locked	QAM256	9	553.8	8.5	41.1	0	0
11	Locked	QAM256	10	559.8	8.9	41.2	0	0
12	Locked	QAM256	11	565.8	9.4	41.4	0	0
13	Locked	QAM256	12	571.8	9.8	41.4	0	0
14	Locked	QAM256	14	583.8	10.2	41.5	0	0
15	Locked	QAM256	15	589.8	10.3	41.4	0	0
16	Locked	QAM256	16	595.8	10.1	41.3	0	0
17	Locked	QAM256	17	601.8	9.7	40.9	0	0
18	Locked	QAM256	18	607.8	9.5	41.0	0	0
19	Locked	QAM256	19	613.8	9.2	40.9	0	0
20	Locked	QAM256	20	619.8	8.9	40.5	0	0
21	Locked	QAM256	21	625.8	8.8	40.8	0	0
22	Locked	QAM256	22	631.8	8.8	40.9	0	0
23	Locked	QAM256	23	637.8	8.7	40.9	0	0
24	Locked	QAM256	24	643.8	8.9	41.0	0	0
25	Locked	QAM256	25	649.8	9.5	41.0	0	0
26	Locked	QAM256	26	655.8	9.4	41.0	0	0
27	Locked	QAM256	27	661.8	9.9	41.0	0	0
28	Locked	QAM256	28	667.8	10.4	41.1	0	0
29	Locked	OFDM PLC	29	780.0	11.0	38.8	1850031	0
30	Locked	QAM256	30	673.8	10.9	41.0	0	0
31	Locked	QAM256	31	679.8	11.0	41.4	0	0
32	Locked	QAM256	32	685.8	11.1	41.3	0	0

 

Upstream:

Channel	Lock Status	Channel Type	Channel ID	Symb. Rate (Ksym/sec)	Freq. (MHz)	Pwr (dBmV)
1	Locked	SC-QAM	1	5120	36.5	40.8
2	Locked	SC-QAM	2	5120	30.1	40.8
3	Locked	SC-QAM	3	5120	23.7	40.0
4	Locked	SC-QAM	4	5120	17.3	39.5

 

I don't have any spliters on the line - the cable comes from the demarc box outside of the house directly into my modem using a single cable.  Last time I had comcast out, they noted that they couldn't see any issues and because I was running my own modem, there wasn't anything else they could do to help.  I was hoping you all may have some other suggestions for what I could do to keep my internet from dropping.  I'm not adverse to having a tech come out again, I'm just trying to see what else I can do on my end first.

 

Thanks