How is the bank card frozen?

The cardholder touched the bank's risk control system and the transaction was abnormal.

If the bank card is not used for a long time after processing, the bank will generally put the bank card to sleep. At this point, if the bank card wants to resume its function, it is generally necessary to go to the bank counter to activate it. Another situation is that the bank card fails to apply for a new card on time when it expires, and the old card will be frozen by the bank after it expires.