Maybe the chip is magnetized. The recorded information of bank cards and bankbooks are stored on the magnetic stripe on the back. The strong magnetic field generated by high-frequency electromagnetic waves generated when the mobile phone works will magnetize the credit card, making the recorded information disordered, thus leading to the invalidation of the bank card. At the same time, some citizens put mobile phones, bank cards and other items together in their bags, which can easily lead to the bank cards being "degaussed". In addition, if the magnetic strips of two bank cards overlap, they are likely to be demagnetized at the same time. In addition, some medical inspection equipment such as the magnetic hidden buckle of the lady's handbag and the nuclear magnetic resonance instrument will also cause the bank card to be magnetized. Your relevant information is recorded and stored on the magnetic stripe of the credit card. If the magnetic stripe information is weakened, changed or lost, when you use this card to make a transaction, terminal devices such as POS and ATM may not be able to read the correct bank card information, resulting in a transaction failure. Therefore, it is best to put the bank card in a wallet with hard leather, and don't be too close to the magnetic buckle. Never throw it in a messy bag to prevent sharp objects from being worn, scratched or twisted. At the same time, it is best not to put multiple bank cards together, let alone put two bank cards back to back, so that the magnetic strips collide with each other. We should try to stay away from the high magnetic field around induction cookers, microwave ovens, televisions, refrigerators and other electrical appliances, and should not place magnetic objects such as mobile phones, computers, palmtop computers, magnets, music stars and business links.