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nrf51822 automatically shut down after several transmission.

Hi guys,

I am using nrf51822 and SDK 11. I have some trouble about suddenly reset the nrf51822.

In my application, I used uart_fifo to received some information from other microcontroller, I stored some information to the flash using fds module, and then I transfered the information to the smart phone when it needed. In the uart interrupt, I call the transmit function (notify) which enabled by receiving signal from smart phone. After a while, it suddenly reset nrf51822. I don't understand why it happening since it took different time to reset, for some times, it took 10 second, some times it took around 5 minutes. What could be the trigger for nrf51822 to reset?

Thank you for your time.

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