DNS not resolving at all

Hi guys

I had a patch of time, where i was not getting DNS responses from nextdns.io.

it was so bad that I could not even open nextdns.io to see what the cause is.
times below from the log files from when I suspect the issue occurred

 nslookup commands:

192.168.0.2 is my default gateway which has next DNS configured with a linked IP. no changes in nextdns configuration since last night.

Microsoft Windows [Version 10.0.19045.4170]
(c) Microsoft Corporation. All rights reserved.

C:\Users\Erwin>nslookup www.google.com
Server:  OPNsense.erwin.local
Address:  192.168.0.2

*** OPNsense.erwin.local can't find www.google.com: Server failed

C:\Users\Erwin>nslookup www.google.com 1.1.1.1
Server:  one.one.one.one
Address:  1.1.1.1

Non-authoritative answer:
Name: www.google.com
Addresses:  2c0f:fb50:4002:809::2004
          192.178.54.36

C:\Users\Erwin>nslookup www.google.com 45.90.28.154
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  45.90.28.154

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out

C:\Users\Erwin>nslookup www.google.com 45.90.28.154
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  45.90.28.154

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out

C:\Users\Erwin>nslookup www.google.com 45.90.30.154
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  45.90.30.154

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out

C:\Users\Erwin>nslookup www.google.com 45.90.30.154
Server: dns2.nextdns.io
Address:  45.90.30.154

Non-authoritative answer:
Name: www.google.com
Addresses:  2c0f:fb50:4002:812::2004
          192.178.54.4

the weirder part is that the log file does not show then failed requests, even though I specifically targeted your DNS with nslookup.

Is there anything that could explain this behaviour?

I am looking to use nextdns in our company production environment, but having a few angry colleagues due to DNS failing to respond at all is not going to sell this implementation at all :)