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sd_app_evt_wait() waking up before the expected time

I am using the nrf52840  with freertos and bluetooth (based on the HRM example). Application is designed to sleep for a set period of time before the RTC timer wakes the MCU. I am using sd_app_evt_wait()  to put the MCU in the systemON sleep. But i see that the MCU is waking up before the expected time. how can i find out whats causing the wake up? Could the RTC1 used in the Freertos be causing the wake up? 

Thanks

Sharu O

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