What is wrong?

Hello.
Greetings,
For a few days now I've been experiencing strange behavior when accessing applications, websites, among other things. In fact, one of the strange behaviors was my Firefox saying that there was a failure in my DNS, this happened twice during the night.
I've been using NextDNS for a while, this has happened a few times, but they were quickly resolved without me doing anything.
However, in the last 3 days this has been affecting my use on the computer, note that this seems to be specific to the computer, I have not noticed any problem on the cell phone that I can be completely sure is the fault of the DNS.
I will be attaching the link where I tested NextDNS.

I am from Brazil.

https://nextdns.io/diag/33c836a0-e58e-11ee-9edf-71fc5d6d6140