CM600 Modem T3 & T4 timeouts

I'm experiencing an annoying amount of disconnects from the Comcast service. Comcast says all is ok on their end and logs show this:

Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=2c:30:33:06:12:d0;CMTS-MAC=00:01:5c:68:74:73;CM-QOS=1.1;CM-VER=3.0;

Any insight on what I can do to remedy this?