DNS profile issues in iOS 26?

I have been experiencing intermittent issues while using the DoH 9.9.9.9 profile on my iOS 26 devices (https://docs.quad9.net/Setup\_Guides/iOS/iOS\_14\_and\_later\_%28Encrypted%29/#download-profile).

Some websites not loading, apps not working, (iCloud) messages not coming through. The only way I could fix said issues was by switching to Automatic or switching to another DNS provider profile, like Cloudflare or NextDNS.

Has anyone else noticed anything similar?