I do not see any issues with Polsat or NC+, all is working without freezes.
You have to know that
1. during freezes, you have to check ping and route to the server (it says on the internet provider problems)
2. show log-file, because just to tell about freezes or any other issues without showing log-file is not sufficient, even if the issue is experienced by 2-3 other persons.
Look at the models of receiver used - in most cases, it is Nbox 5800, and in one case - it is Ferguson Ariva, these are not ideal receivers for sharing if you do not know their specifics.
Many times I asked users to use SEARCH option of the forum to find out typical problems faced by the users. Now, what can I do if 3 users with Nbox 5800 experienced problems yesterday afternoon (the time of the post is 19PM - evening!!!) and other post time is 2.45 hrs later though the problem started since Thursday...
As for me, I am watching polish channels now without any freezes (though, weather is not fine, it is snowing).