First, not that it's causing your problem, but watch out for the CM700. Has the lemon Puma 6 CPU inside it. While Cox is in the process of rolling out the newest patch it has been a long time coming, and is still hit or miss. CM600 or CM1000 would be the models above and below the CM700 which are not effected by the bug.
With that said, your issue is your upstream power levels. Looks like noise is occuring randomly and forcing your modem to yell to be heard, causing the T3 errors. Can you describe how the coaxial gets from the street to your house? Splitters? Amps? Underground wiring?
