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Why does it show 0.00 yuan when checking the balance of a Datong commercial bank card at a postal ATM?

UnionPay communication fails, or the cash machine is restarting internally. I can share something with you. Each cash machine will restart internally once every 24 hours. The process takes about 2-3 minutes. If During operation at that time, the number will display 0.00 or directly display communication failure.