Zephyr/nRF Connect on custom board - 20 microamps in ksleep()

Hi, 

I am using Zephyr to do some action in a main loop and ksleep for 30 seconds. While in ksleep(), I can see that the consumption is 20ua. The board is a very small simple board which only has a button and four LEDs on it. The LED's are off in ksleep. Things that I have tried:

1) Turned off UART

2) CONFIG_SERIAL = n

3) Turned off debug/logging and disconnected debug tools (JLINK) and power cycled

4) The code advertises in BLE before the ksleep, but i make sure to shut down advertising before sleeping by running  bt_le_adv_stop();

What could be causing it?

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