Intermittent outages to Internet and Cox Phone happening frequently

I've been having intermittent issues for at least the last month.  The issues affect both my internet and my cox phone (two separate modems) so I don't believe that the modem hardware is the issue.  Basically, 3-5 times a day the connection will randomly go down, with the internet modem (SB6121) reporting T3 Ranging errors.  Sometimes it will come and go a few times over the course of 30-45 minutes before finally settling down for a few hours.  I've called a few times and they've said that there's been outages in the area but this seems too frequent (unless the outages haven't been fixed in a way that solves the problem?). 

Anyways, I've been a pretty happy customer for 15+ years because the connection is generally reliable but this is getting frustrating.

Modem log from this morning:

Time     Priority     Code     Message
Aug 16 2016 09:00:49     3-Critical     R02.0     No Ranging Response received - T3 time-out;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:30:15     6-Notice     I502.0     Received REG-RSP while in REG-HOLD1 state;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:30:10     3-Critical     R02.0     No Ranging Response received - T3 time-out;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:29:12     6-Notice     I401.0     TLV-11 - unrecognized OID;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:29:12     5-Warning     Z00.0     MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:01:00     3-Critical     R02.0     No Ranging Response received - T3 time-out;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:01:00     3-Critical     R07.0     Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:56     3-Critical     R02.0     No Ranging Response received - T3 time-out;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:42     3-Critical     R07.0     Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:36     3-Critical     R02.0     No Ranging Response received - T3 time-out;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:25     3-Critical     R07.0     Unicast Ranging Received Abort Response - initializing MAC;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:19     3-Critical     R02.0     No Ranging Response received - T3 time-out;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Jan 01 1970 00:00:13     6-Notice     N/A     Cable Modem Reboot due to T4 timeout ;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:27:41     3-Critical     R02.0     No Ranging Response received - T3 time-out;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:27:41     3-Critical     R06.0     Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:27:41     3-Critical     R03.0     Ranging Request Retries exhausted;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:27:40     3-Critical     R02.0     No Ranging Response received - T3 time-out;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:27:35     3-Critical     R06.0     Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:27:35     3-Critical     R03.0     Ranging Request Retries exhausted;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;
Aug 16 2016 08:27:35     3-Critical     R06.0     Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=00:00:00:00:00:00;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.0;