Seems like OTP bank (Hungary) became bitcoin hostile
Msg from Bitstamp:
Please note that OTP bank does not process bank transfers that originate from bitcoin related businesses. This means that any transfer sent to your bank would be rejected and returned to Bitstamp. We kindly suggest you use alternative banking details when requesting future bank withdrawals.
Did some research and it looks like the problem is on the Bitstamp side. Actually it seems like OTP is rater Bitcoin friendly: