This problem is caused by many reasons. our departments concerned are checking the product record during that period of time. In order to solve and avoid such problem happen again, we need you to offer the following information:1. Pictures showing the applicance process of products.2. The reason that TYPE 316 never has such problem, is its material has good toughness and low intensity. For further information, we believe we will give ou a professional explanation and satisfied solution as soon as possible. 全是自己翻译的,希望对你有用(⊙o⊙)哦