This same thing has happened to me multiple times with several banks. I used to do a lot of P2P trading on Paxful, it was a great extra source of income for a while until I started getting charge backs and otherwise flagging fraud detection algorithms due to very frequent trades.
Glad to hear you ended up coming out of this with your account balance intact. But definitely can relate to what you went through, I was pulling out my hair for over 3 months as well and now have multiple checking accounts to hopefully prevent myself from ending up in that situation again ( I no longer P2P trade as well).