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nrf51422 don't run on the second time

Hi, I have a wired problem with the nrf51422,

I'm loading the code using the J-link into my board or the evaluation board (PCA10007) that I have, the code runs perfect without any errors/warnings.

but after I disconnect the debugger, power off the board and turn it on back again , the board don't run...

I'm checking the board using nRF2779 dongle and ANT+ Display simulator V1.900 in HRM Display mode, in working mode I can see the packets and also to see the heart rate.

I've thought maybe the problem came from my code, so I've tried to run ant_hrm_tx example code, I've update is the system clock to NRF_CLOCK_LFCLKSRC_RC_250_PPM and the HRMTX_NETWORK_KEY to {0xB9, 0xA5, 0x21, 0xFB, 0xBD, 0x72, 0xC3, 0x45}

Did I missed something?

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