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NRF52832 BLE NUS current consumption too high

Hi:

     I am using NRF52832    SDK14.1.0   S132   BLE_APP_NUS 

Power supply:  3.3V 

HW resource usage: 6 channel GPIOTE / 6 button pull up / 6 gpio input pull up / usiing external HFCLK / internal LFCLK/  TIMER2 TIMER3 using/  about 7 app timer on

pull up resistor is about 100K 

-Number- -power source- -power consumption- -system-status-
1 LDO 2.1mA Low power mode
2 DC-DC 1.5mA Low power mode
3 LDO <100uA sleep

I want to know how to decrease power consumption when in low power mode less than 200uA ?

( Note: when I use NRF51822  SDK6.1.0   ble_app_uart   the current is only 250uA when system on, WTF! why NRF52832 is so high? )

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