1. It may be the ATM machine network delay;
2. It may also be that the magnetic strip or chip on the bank card has been demagnetized.
Note: This kind of failure generally occurs, it is recommended to replace an ATM machine, if not, that is, the card has a problem, generally can go to the business hall counter to ask for assistance to solve, to see whether the card is damaged or degaussing.
You already know to contact the card issuer, there's really no need to ask questions.