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the keyboard(use GPIOE interrupt) has no response

Hi,

I have a strange problem, I use NUS service connect with phone , send or receive data,after some process,may happen the keyboard(use GPIOE interrupt) has no response, but the system can run normal (include timer interrupt, WDT), sometimes the ble also can't work,sometimes can work normal. it's very trouble me, why it is happend? maybe the system stack?