Errors on modem

I've been having issues with high latency lately, and I noticed that there are some serious-looking event log entries in my modem (I invalided the MACs for security). Usually when this happens I reboot the router and everything's OK for a while.. 16 consecutive T3 timeouts while trying to range on upstream channel 1;CM-MAC=e8:zz:zz:zz:zz:z8;CMTS-MAC=e8:zz:zz:zz:zz:z8;CM-QOS=1.1;CM-VER=3.0; Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=e8:zz:zz:zz:zz:z8;CMTS-MAC=e8:zz:zz:zz:zz:z8;CM-QOS=1.1;CM-VER=3.0; Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=e8:zz:zz:zz:zz:z8;CMTS-MAC=e8:zz:zz:zz:zz:z8;CM-QOS=1.1;CM-VER=3.0; Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=e8:zz:zz:zz:zz:z8;CMTS-MAC=e8:zz:zz:zz:zz:z8:63;CM-QOS=1.1;CM-VER=3.0; Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=e8:zz:zz:zz:zz:z8;CMTS-MAC=e8:zz:zz:zz:zz:z8;CM-QOS=1.1;CM-VER=3.0; TLV-11 - unrecognized OID;CM-MAC=e8:zz:zz:zz:zz:z8;CMTS-MAC=e8:zz:zz:zz:zz:z8;CM-QOS=1.1;CM-VER=3.0; Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=e8:zz:zz:zz:zz:z8;CMTS-MAC=e8:zz:zz:zz:zz:z8;CM-QOS=1.1;CM-VER=3.0;