No local DNS resolution & Froze UI when no internet connection

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a) and found no answer

- [X] I have searched other issues and found no duplicates

- [X] I want to report a bug and not [ask a question or ask for help](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a)

- [X] I have set up AdGuard Home correctly and [configured clients to use it](https://github.com/AdguardTeam/AdGuardHome/wiki/Clients). (Use the [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions/categories/q-a) for help with installing and configuring clients.)

### Platform (OS and CPU architecture)

Darwin (aka macOS), ARM64

### Installation

Docker

### Setup

Other (please mention in the description)

### AdGuard Home version

0.107.46

### Action

Hi,

I had an internet connection failure today, probably some maintenance at my ISP.
While this happened, AGH behaved really erratically.

Let me explain :
My home mimics an enterprise setup, with an Active Directory, and DNS integrated zones.
AGH is set up as my main DNS on all clients, and is is set up to send all queries related to my local DNS to the domain controllers, while handling all internet DNS.
It always worked like a charm, for many years.
However, while disconnected today, it didn't handled anything anymore, not even the local domains.
I kept having "...i/o timeout" on every line in the log.

At first, it was behaving so buggy that I thought it was the culprit for my connection issues... I tried changing upstream DNS, and adding a failover, and each time I tried to apply the UI froze completely, without updating the settings.

### Expected result

At least to forward local domains / PTR to the AD controllers

### Actual result

See above.
Everything turned back to normal as soon as my connection came back up.

### Additional information and/or screenshots

AGH v0.107.46 installed as a docker container on an Ubuntu 22.04.4 LTS
PFSense router.
Active Directory with DNS integrated zones (no forwarding), and DHCP handled by Domain Controllers.