resolving .org - connection timed out; no servers could be reached

[Stephane Bortzmeyer]

On Sun, Jan 12, 2020 at 11:41:12AM +0100,
 Erik Dobák via unbound-users <unbound-users at lists.nlnetlabs.nl> wrote 
 a message of 61 lines which said:

> i tried to resolve diverse .org domains and for a few minutes it was
> not possible while non .org domains resolved without a
> problem. after ~15minutes the issue was gone and i could resolve
> also the .org domains without changing anything on my setup.

During the problem, was it possible to resolve names in other TLDs?

.org name servers are quite concentrated in operator, IP prefix and AS
so a routing issue may, in theory, create trouble. But, AFAIK, nobody
reported a problem recently.

> or does it mean that unbound on router was reached but unbound could
> not reach/get response from root DNS servers?

Anyway, if it was specific to .org, it cannot be a problem with the
root (hence my first question).