I purchased a new modem last night, the Motorola SB6141 since it was one of the best reviewed and most reliable of the list of approved modems by Comcast.
I activated it, it works, I'm using it now, and I get full speed when I'm connected.
However, every 10-20 minutes, I get disconnected. I had a technician come to verify that everything on my end is good. That's the cabling, signal strength, connections, you name it.
Here are my signal levels:
[3] 64QAM
[3] QPSK
[3] 64QAM
[3] QPSK
[2] 16QAM
Ranging Status Success Success Success
Here's the logs
May 08 2014 18:42:19 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot from GUI/Configuration page ;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 18:27:22 5-Warning T202.0 Lost MDD Timeout;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 18:27:19 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 18:26:59 3-Critical T05.0 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 18:22:09 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0; May 08 2014 18:13:30 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 18:13:26 5-Warning T202.0 Lost MDD Timeout;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 18:13:14 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 18:13:02 3-Critical T05.0 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 18:07:04 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0; May 08 2014 17:35:58 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 17:30:31 5-Warning T202.0 Lost MDD Timeout;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 17:30:29 3-Critical R04.0 Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 17:30:07 3-Critical T05.0 SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; May 08 2014 17:14:49 5-Warning Z00.0 MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:01:5c:50:86:4f;CM-QOS=1.1;CM-VER=3.0; Jan 01 1970 00:00:15 6-Notice N/A Cable Modem Reboot due to power reset ;CM-MAC=30:60:23:ce:d0:91;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Configuration:
Configuration Frequency Plan: North American Standard/HRC/IRC Custom Frequency Ordering: Default Upstream Channel ID: 5 Favorite Frequency (Hz) 651000000 DOCSIS MIMO Honor MDD IP Mode Modem's IP Mode IPv6 Only DHCP Server Enabled