The bank won't tell you if you are under suspicion or investigation. They will keep their mouths zipped while they do things behind the scenes. If it gets to a point when your transactions are really suspicious, they will form an investigative team and check your patterns of payments. Onward and outward payments, that is. They will also try to see if any of the persons you wire money to or receive money from are known "launderers" which is an event triggered when those persons are also under investigation. It all starts with an infogram or an infographic representation of who's who on their radar. When your name pops up on it, then you and your account become part of the investigation.
You won't get in trouble if your transactions are legit and if you use an account which allows the transactions you do. For example, if you are using a personal account for large scale money remittances or money exchange or Forex transactions, then the bank might start to wonder and check how the transactions are structured. If their T&Cs say you can only do such transactions on a business or corporate account, then that's when they will terminate your personal account. Even if you have a business account, you must carefully understand what they do and don't allow. Not all banks are happy with clients who do digital currency trades.
I'm not sure how the rules apply but you might also want to look into the FinCEN regs. If you don't and if you are required to be registered, then you might want to carefully think about what you're doing. The US government is a well woven spider web and banks are linked to that web.
The first sign of trouble is when you can't log into your account or if you can't withdraw any money. Frozen funds are another indicator of your account being flagged.
Here are some clues:
Red Flags!
