1. design reason: the pin design of the plug-in is unreasonable or does not conform to the standard specification, which leads to the pin being easily bent or deformed during plugging and unplugging, resulting in flattening.
2. Machinery and equipment problems: Improper operation of machinery and equipment or problems of machinery and equipment itself lead to excessive stress or pressure on the plug-in when plugging and unplugging the machinery and equipment, which makes the pin easily deformed or flattened.
3. Improper maintenance: If the plug-in is used for a long time or maintained improperly, such as incomplete cleaning or improper storage environment, the surface of the plug-in pin will be oxidized or corroded, and the pin will be easily deformed or flattened.