A small merchant usually gets about 2 chargebacks a day. Today it got 6. Risk is asking whether this is abnormal and whether we should freeze the merchant. How would you assess it?

有个小商户平时每天平均有2笔拒付，今天突然来了6笔。风控问这算不算异常、要不要冻结这个商户。你怎么判断？