Constant T3 timeouts for the last 3-4 weeks.

I see the same, and I've had service techs out, and I've even bought a backup modem so I can show them it's broken on both. So far as I can tell, there's just random upstream noise -- channels never resync, modem doesn't reboot. It feels like Cox should (a) be able to monitor and detect this and (b) care more about proactively notifying us and fixing it.