I have an open discussion started on the Mediacom Support forums, but thought I'd present the issue here, as well, perhaps some others might have had similar experience and can tell me if it's worth waiting on a tech visit versus replacing my modem as next step:
My data speeds were way down a few days ago, and my internet reliability seems to have suffered since some work was done for a neighbor around December 19th, so a couple techs stopped by yesterday, verified that my DS power levels were horrific (-14) and replaced the drop cable (it was still RG59) and put a 2-way splitter between that and the modem with the other side feeding all of the video lines in the house. Power levels seemed to bump up to the -2 to -5 range and they left happy.
Last night, the modem just kept rebooting every 15-45 minutes, logging timeouts right before the restart would happen. This morning, I checked the DS power levels again and, though they would start at -4 to -6 after a reboot, they degraded to -9 to -10 over the next 30 minutes then the modem would log a T3 timeout and "reboot due to T4 timeout." This seems to keep happening over and over.
I've removed the one other splitter, which helps the top end power levels reach -2 to -3, but doesn't stop the slow degradation of power followed by a reboot, rinse and repeat.
Does this seem like perhaps a modem problem? I find it odd that the quirkiness started immediately after a change was made at the Tap at the street, but it could just be coincidence, too. Here are my details from the latest snapshot from the modem:
Model Name: SB6141
Vendor Name: Motorola
Firmware Name: SB_KOMODO-1.0.6.13-SCM00-NOSH
Boot Version: PSPU-Boot(25CLK) 1.0.12.18m3
Hardware Version: 7.0
Serial Number: 374781234222773209020022
Firmware Build Time: May 6 2013 17:53:59
Downstream Bonding Channel Value
Channel ID 53 54 55 56
Frequency 111000000 Hz 117000000 Hz 123000000 Hz 129000000 Hz
Signal to Noise Ratio 35 dB 35 dB 35 dB 34 dB
Downstream Modulation QAM256 QAM256 QAM256 QAM256
Power Level
-8 dBmV -8 dBmV -9 dBmV -9 dBmV
Upstream Bonding Channel Value
Channel ID 1
Frequency 25000000 Hz
Ranging Service ID 15
Symbol Rate 2.560 Msym/sec
Power Level 50 dBmV
Upstream Modulation [8] 16QAM
Ranging Status Success
Signal Stats (Codewords) Bonding Channel Value
Channel ID 53 54 55 56
Total Unerrored Codewords 14331996 13324087 13272335 13318651
Total Correctable Codewords 1215 3421 35289 24144
Total Uncorrectable Codewords 541 511 28595 1583
Jan 03 2014 11:34:28 6-Notice I401.0 TLV-11 - unrecognized OID;CM-MAC=38:6b:bb:e0:91:94;CMTS-MAC=00:21:a0:fb:b5:6b;CM-QOS=1.1;CM-VER=3.0;
Jan 03 2014 11:34:28 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=38:6b:bb:e0:91:94;CMTS-MAC=00:21:a0:fb:b5:6b;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:22 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=38:6b:bb:e0:91:94;CMTS-MAC=00:21:a0:fb:b5:6b;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to T4 timeout ;CM-MAC=38:6b:bb:e0:91:94;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Jan 03 2014 11:33:38 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=38:6b:bb:e0:91:94;CMTS-MAC=00:21:a0:fb:b5:6b;CM-QOS=1.1;CM-VER=3.0;
Jan 03 2014 11:33:37 3-Critical R06.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=38:6b:bb:e0:91:94;CMTS-MAC=00:21:a0:fb:b5:6b;CM-QOS=1.1;CM-VER=3.0;
Jan 03 2014 11:33:37 3-Critical R03.0 Ranging Request Retries exhausted;CM-MAC=38:6b:bb:e0:91:94;CMTS-MAC=00:21:a0:fb:b5:6b;CM-QOS=1.1;CM-VER=3.0;
Jan 03 2014 11:33:36 3-Critical R02.0 No Ranging Response received - T3 time-out;CM-MAC=38:6b:bb:e0:91:94;CMTS-MAC=00:21:a0:fb:b5:6b;CM-QOS=1.1;CM-VER=3.0;
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