it might be unrelated, but yesterday my PSN got hacked.
Luckily I was online when it happened, I all of a sudden got the message I was logged in on another PS4.
They had set their PS4 as primary which you can only change once every 6 month so I couldn't change it back.
I had to call Playstation to deactivate theirs an set mine as primary again. And of course change the password and set up the 2 step varivication.
They could see that it was logged in in Russia, not that this has any significance.
Anyway, maybe this has happened to your account and they did some stuff to get you banned.