I will now blame .pl for all of this ... even though it might also be a problem in the chain of my dns resolvers but as
- it is only .pl domains and
- everything else (and for other domains) works fine
having a look on dnsviz.net for midov.pl I see a number of changes starting 2022-12-08.
This is 2022-08-28:
This is a picture on onet.pl from 2022-12-08
and now
I assume the changes together with caching is causing my troubles.