1. Because funds are frozen abnormally. Unknown capital injection in the bank card, serious overdue circumstances of the lender's credit card, etc., will cause the card to be frozen. The bank also freezes the card for the sake of ensuring the safety of funds and risk control, so when using it, there will be a prompt that the bank card is abnormal.

2. The password has been entered too many times. If the lender enters the payment password incorrectly many times during repayment, and the bank system receives a warning and will temporarily lock the card, then the card will also be unusable and a prompt of card abnormality will appear.

3. Sleep. Sometimes, if the card is not used for too long, it will also enter a dormant state, and if the lender suddenly uses it, it will also prompt that the card is abnormal.