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LM358 同相输入端与GND短路问题

Other Parts Discussed in Thread: LM358

LM358内部电路如上图,有个产品使用LM358做电压跟随器电路,但从现场返回的产品发现LM358芯片同相输入端引脚与芯片GND引脚内部短路,同相输入端电压不会超过1V.LM358芯片供电电压为12V.单电源供电。从内部电路分析看因是Q4三极管短路才会引起LM358短路。不知什么原因引起LM358芯片内部电路短路,即Q4三极管短路?