I'm a Time Warner customer in North Carolina and have IPv6 service. It works well, but the IPv6 networks aren't statically assigned, so I can't reach my devices at home reliably.
Does TW use DHCPv6-PD to allocate networks to customer sites? If it does, are you sure that your router is presenting the same DUID to TW's DHCPv6 servers?
IME, as long as you present the same DUID to Comcast's DHCPv6 servers, and your equipment renews its DHCP lease before the expiry time, you retain the same IPv6 prefix.
