So the issue stems from the fact that the router is trying to update to dnsomatic every 30 seconds and opendns/dnsomatic only allow one poll a minute. Any more and it gets flagged as "abuse"...
So recently dnsomatic changed their login to use the same as opendns.
This seems to have afffected my router dnsomatic based update to opendns.
Now I get the following in my logs:
ul 31 16:53:18 rc_service: watchdog 360:notify_rc start_ddns
Jul 31 16:53:19 start_ddns: update WWW.DNSOMATIC.COM...