When you ask the bank why they close your account, whether their answer? In my opinion there is only one reason why the bank closed the account of the person, ie since the bank go bankrupt. In my country there ever bank that went bankrupt and closed more than 1 million accounts of customers and amount to trillions. I personally still believe the bank because I am sure the bank that I chose is a bona fide bank. You can sue him in court if you do not make mistakes that lead to your account closed.
In this case the account is closed and the bank is still operational. I think Op is hiding something. As far as I know bank cannot freeze or close your account unless there is a court order. About balances being drained, there is a fee using their service to store your money. So don't surprise if in the long run your account balance become negative.
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In a day to day operation of the bank as well, we do receive memorandum from AMLC for suspicious person and we double check it with our system and report directly to them in an encrypted report file.
Hear it from the bank guy. This might be the case with OP.
Thats what im suspecting too on which OP do hide something here and not too much elaborating on the actual situation why the bank did close his account because theres no crazy bank would tend to close an account without any valid reason and if they do such act then you might done a thing that is against their rules.Its just simple as that. Better to tell us the true reason.