We change our US accounts to a UK address years ago; that's no big deal, and either is transferring funds....unless of course you are talking gazllions, in which case banks tend to want to know the source of said gazillions.
Without knowing what BofA has emailed and/or said, it's difficult to provide any specific advice or opinion, but for sure this should not mean you need a financial advisor.
Most likely is that you are being reminded of your possible reporting requirements under FATCA, obligation to file a US tax return, and so forth.
Don't panic.