Intermittent disconnection DoT on Android

When setting family(dot)Cloudflare-dns(dot)com as DoT in Android 12 S2SES32.28-70-3, I intermittently (ca. every 30mins) get the notification that “this network does not have internet access” (or something close to that), which disappears after a second or two. I did not have this issue when using (no DoH/DoT) on a device with an older version of android.

Is this an Android or Cloudflare bug?
Where do I file a bug report?
How do I solve this? (using app is not an option because it uses VPN)

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