1, not using the credit card for a long time or reducing the frequency of swiping the card will lead to a decrease in the amount. When the activated credit card is idle for a long time, the frequency of swiping the card gradually decreases, and the amount used is less, the bank will reduce the amount.

2. The code-hopping POS machine triggered the bank's risk control system, which led to the card being downgraded. The most common way to skip the code is to swipe the card locally, but the bill shows the consumption in different places, especially swiping the card in different cities many times on the same day, which will lead to the bank's risk system being touched, stolen and controlled by the wind.

3. Suspicious high-risk transactions are blocked. Banks have a complete risk assessment system. When it is detected that the cardholder has high-risk transactions, such as long-term large-value transactions with the same merchant, large-value card swiping immediately after repayment, large-value card swiping during abnormal business hours, etc., it may lead to card death.