Refer to this post for more about rate limits:
As I understand it, your domain is a DynDNS domain, which is shared by many users, which is why you'll run into the rate limits quite fast.
You have two options:
- Switch to a DynDNS provider that is on the Public Suffix List or ask your existing provider to add themselves to this list (Note: This process can take a few months)
- Get your own domain and create a CNAME record that points to your DynDNS domain.
.tk domains, for example, are free.