AdGuard VPN notification icon disappears after some hours, but remains connected to the server

### Please answer the following questions for yourself before submitting an issue.

- [x] I checked the [knowledge base](https://adguard-vpn.com/kb/) and found no answer
- [x] I checked to make sure that this issue has not already been filed

### AdGuard VPN version

2.16.4

### Operating mode

Integration with AdGuard

### Which DNS server do you use?

AdGuard DNS Non-filtering

### DNS protocol

Regular

### Custom DNS

_No response_

### Environment

```markdown
- OS:HyperOS 2.0.16.0 / Android 14
- Device: Redmi Note 12 Pro+ 5G
```

### Root access

- [ ] yes, I have it

### Issue Details

Steps to reproduce:
1. Being connected to a server
2. Usually happens overnight, when I don't use my phone, but happened during daytime as well.
3. Usually happens when connected to a more stable network as WiFi, happens rarely when connected to mobile data, because is less stable and sometimes it restart the connection
4. When I wake up the notification AdGuard VPN icon is gone, but the standard AdGuard notification is still there. But if I open AdGuard VPN I can see it's still connected to the server.
5. If I change from WiFi to mobile (or viceversa) or if I manually disconnect from the current server and reconnect, the icon reappears

### Expected Behavior

The notification icon remains visible until a kill or close the app.

### Actual Behavior

The notification icon disappears after some hours and you have to change network or reconnect to the server to make it reappears

### Screenshots

Screenshot 1

### Additional Information

I saw there's a bug #687 where the user says his icon turns from green to white, so maybe my icon turns from white to transparent?

I collected log this morning after I woke up, extended for VPN, regular for AdGuard and bug report for Android. Tell me if you need them.