There are several possibilities. One is that your card is degaussed, that is, it is usually placed with your mobile phone. If this is the case, you can go to the bank to solve it. The other is that the line is not smooth when swiping the card, so it is impossible to swipe the card. I've been in this situation. Another is that bank cards cannot be swiped at certain times. I swiped it at a shopping mall. Other bank cards can be swiped, but CITIC cards can't.