Background: 1.5% of products which use STM32F107 didn't work after using 3 months; Lithium battery is the power supply source. The products were used in car. This phenomenon suddenly occured without any pridication. According the record in product, the temperature is normal(25 Centigrade).
Problem Analysis: The voltage at VDD is 3.3V. The NRST reset do not work. After disconnecting the power and connecting again, the chip could recover and work again. And this problem could not be reproduced in our lab condition.
Additional information: the chip use STANDBY mode to shut down and use WAKE UP pin back to work.
The schematic is attached below.(Only the core components displayed)
Is the schematic wrong or did I missed something? 
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