I'm not aware of a related change at Oracle/Dyn regarding the DynDNS Pro service unless you have a D-Link account.
It seems the IP address information for your hostnames goes out of sync. Do you run update clients covering all of your hostnames? Check their logs to see if they behave correctly.
I have 20+ cam going through my dyndns host account
Hardly. No traffic ever goes through your account, never. And Dyn never connects to your cams. This is not how DNS works. DNS is the phone book of the internet, not the phone lines.
As Rotblitz has said, no changes have happened on the Dyn DNS side of things that would cause this. Is there a second update client running on the network that might be causing issues?
Oracle + Dyn