Last night's maintenance kicked my modem offline

I have a Cisco DPC3010 (DOCSIS 3.0) modem at home. I have the 'roomate' connection, which means there is another modem in the house. 

Last night, my modem went offline. Happens once every few months. I called Cox, said there was maintenance going on in my area. Today morning, it was back online. Then went offline again, so i called tech support and got the automated 'reset your modem' robo-lady. She reset stuff on her end, and my modem was back online. 

10 mins later, my modem goes offline again. I called tech support again, this time for a human. He did his thing on his end, but no luck. We tried to reset modem, power-cycle, hard-button-reset, etc. Nothing worked. 

Funny thing is, the other modem in my house is working just fine. I am able to connect to the internet through it.

What should i do now?

 Modem firmware details - 

Bootloader Revision: 2.3.0_R1
Current Software Revision: d3000-v302r125533-120716a-COX
Firmware Name: d3000-v302r125533-120716a-COX.bin
Firmware Build Time: Jul 16 17:16:46 2012