Similarly, not de-banked, but I did recently have a payment blocked, with no explanation from my bank other than that the recipient seemed suspicious. It was a payment made in person to a garage that had just serviced my car, to which I've been going for servicing for ~15 years, for an amount similar to the usual cost. This was rather worrying as if they'd block that I have no idea what other payments might mysteriously fail (the bank's agent did not seem to understand why this might be a concern).