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High current drawn by nRF51422 chip during brown out reset

I am using a solar powered energy harvested circuit to power the nrf51 module. However, when the generated voltage drops below 1.8v, the nrf51422 enters into brown out reset and is drawing close to 500uA of average current. Is this expected? The same amount of current is drawn by the device when the reset pin is pulled low (active low reset). Is there a way to reduce the drawn current when the reset is active?

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