Been having this issue for a few days now. Here is how it goes:

1. I connect to Wifi with Private DNS set to off.

2. I change Private DNS to dns.adguard-dns.com

3. I get error "Private DNS server cannot be accessed".

4. Wifi is connected but no internet.

5. Sometimes, it connects, goes through and works for a few minutes. Then it just hangs and no internet. No DNS errors.

6. I disable Private DNS. Internet starts working again. I try to set Private DNS to Adguard and I start back at #3.

7. When I set to NextDNS, zero issues.

Device: S23U unlocked with OneUI6.1

When I check the Adguard DNS status page, when internet works, I sometimes get an Orlando server and sometimes another server with chi in it. When it doesn't, I cannot get webpage to load.