About a Week ago, I bought the Premium Edition of Battlefield 4 to prepare for the release of BF2042. Today I wanted to play on a server of the Server-List and a message appeared, that i was banned by BF4DB. How can this be? It says on my account here that my account is linked to another, but this is the only account I have. Can anyone help me?

That's definitely not some kind of bug, you must appeal on our discord.