It's cultist thinking. They told me that their bank just closed the account because of too much traffic basically. It made them nervous. They're looking for a new bank to work with.
Any banking system to BTC gateway is a way for scammers and hackers to cash-out. Banks don't like that, especially when the funds were stolen from one of their account holders.
"Withdrawals to OKPay accounts will not be cut immediately, but will only be
allowed up to the amount that OKPay users have deposited into Mt. Gox via
OKPay."
Looks like you have hit exactly on why the account was frozen.