Billion DYNDNS issues

Hey, My router (7401VGPR3) has all of a sudden stopped updating my dyndns account (has been working fine for nearly a year)

The latest message from the logs is..

Mar 29 22:56:17 home.gateway:ddns:none: starting to update at [www.dyndns.org (dynamic)].
Mar 29 22:56:17 home.gateway:ddns:none: host name [blank.homeip.net].
Mar 29 22:56:17 home.gateway:ddns:none: username [blank].
Mar 29 22:56:17 home.gateway:ddns:none: my IP address [202.161.000.000].
Mar 29 22:56:32 home.gateway:ddns:none: socket connect fail.
Mar 29 22:56:32 home.gateway:ddns:none: fail to update blank.homeip.net.

The logs are full of these messages over and over.. for at least the last couple of days (last time net disconnected). It try 5 times and then seems to wait 6 hours. I've got the expiry set to 28 days.

I manually updated through their webpage and it worked. Maybe the urls have changed and this firmware is not reflecting it, I'm not sure. I asked Billion and they said it's a dyndns issue. Problem is.. this is a free account and I get nil support.

Anyone else had a similar issue, or any ideas on the cause? I've rebooted the the router a few times and enabled/disable dyndns to 'refresh' it. No luck :(