I was also running 18.104.22.168 with my SB6120 when it stopped bonding 3 downstream channels at the beginning of December. I'm wondering if Cox inadvertently borked the cfg file for this series of modems causing them to fall back to 1 downstream and 1 upstream channel when they threw the switch on their 7 downstream and 4 upstream upgrade. Seems weird that multiple users lost bonding at the same time.
I ended up installing an SBG6580 in bridge mode and in spite of my horrendous SNR and high error count it works like a champ with 7 downstream and 4 upstream bonded channels. -- Politicians are the only people in the world who create problems and then campaign against them. (Charlie Reese)