DuckDNS and iOS companion app "A server with the specified hostname could not be found"

Third party integrations
1

When I export the logs from my phone and analyse them I see:-

(NSURLErrorDomain Code=-1003)

DNS Error 22 (All DNSSEC validated CNAME records did not point to a valid DNSSEC anchored answer.)
“Resolved 0 endpoints” the DNS lookup completed but returned no valid addresses .
“Using unknown from cache” ie returning a cached result

Anyone else having problems like this? not sure when they began but could be as long ago as ix months ago.

I can intermittently get in to the app, but it’s not reliable.

I guess I’d like to try moving away from duckdns - what’s recommended please?

thanks