0.5Mbps slow internet - SNR / signal issues - call tech? (logs included)

[mikus]

My internet has become awful slow recently - 0.5 to 2Mbps.   I dont' see anything amiss in cabling in house, it's a super straight shot.   Modem specs look bad far as I can tell.   Call a tech to check outside line?

CM500 16x4 modem, current firmware and no indications of functionality issues BTW

[mikus]

In case you guys can't see images of my logs either:

Channel	Lock Status	Modulation	Ch ID	Frequency	Power	SNR	Correctables	Uncorrectables
1	Locked	QAM256	21	621000000 Hz	-10.7 dBmV	29.1 dB	42149841	32886
2	Locked	QAM256	11	561000000 Hz	0.6 dBmV	35.8 dB	0	0
3	Locked	QAM256	12	567000000 Hz	0.1 dBmV	35.5 dB	0	0
4	Locked	QAM256	13	573000000 Hz	-0.9 dBmV	34.8 dB	7	0
5	Locked	QAM256	14	579000000 Hz	-2 dBmV	34.1 dB	21	0
6	Locked	QAM256	15	585000000 Hz	-3.2 dBmV	33.7 dB	118	0
7	Locked	QAM256	16	591000000 Hz	-4.2 dBmV	33 dB	379	0
8	Locked	QAM256	17	597000000 Hz	-4.8 dBmV	32.6 dB	2018	0
9	Locked	QAM256	18	603000000 Hz	-5.7 dBmV	32 dB	9993	0
10	Locked	QAM256	19	609000000 Hz	-7.2 dBmV	31.3 dB	132230	0
11	Locked	QAM256	20	615000000 Hz	-8.8 dBmV	30.3 dB	3466569	14
12	Locked	QAM256	22	627000000 Hz	-12.4 dBmV	27.6 dB	243298530	33232375
13	Locked	QAM256	23	633000000 Hz	-13.3 dBmV	26.5 dB	217243375	13238773
14	Not Locked	Unknown	24	639000000 Hz	0.0 dBmV	0.0 dB	0	0
15	Not Locked	Unknown	25	645000000 Hz	0.0 dBmV	0.0 dB	0	0
16	Not Locked	Unknown	26	651000000 Hz	0.0 dBmV	0.0 dB	0	0

Channel	Lock Status	US Channel Type	Channel ID	Symbol Rate	Frequency	Power
1	Locked	ATDMA	8	5120 Ksym/sec	16600000 Hz	36 dBmV
2	Locked	ATDMA	5	5120 Ksym/sec	35800000 Hz	34.8 dBmV
3	Locked	ATDMA	6	5120 Ksym/sec	29400000 Hz	35.8 dBmV
4	Locked	ATDMA	7	5120 Ksym/sec	23000000 Hz	36.3 dBmV

[CCAndrew]

If you’ve done all you can on your end, than yes have a tech out. Those levels and SNR are all over the place. If you need assistance scheduling one let us know.

[EG]

The downstream stream power and the SNR is low / out of spec on most of the downstream channels and the higher frequency ones don't seem to be locking. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the unbonding of channels. 

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.