Problem with hight conspumtion in System on mode

[Freldic_SK]

Hello, I am currently working on a custom board that contains the E73-2G4M08S1C module.
This module contains the nRF52840 chip. My goal is to exit System On periodically every 2 seconds.
I fulfilled this task, but the device consumes 600uA in System On mode, which is quite a lot.
I ran the same code on nRF52840 DK and the consumption in System On mode was 6uA, which is the expected result.
I really don't know where the problem could be. And I would appreciate any help :) I am attaching the scheme and the used code to the attachments.

[Hung Bui]

Thanks Hugh for pointing out. I was looking at the last schematics but couldn't see if the power supply connected to VDDH or VDD.  @Peter: if you want to connect to 4V power supply you would need to connect to VDDH and you need to follow the schematic for supplying to VDDH. Otherwise you would need to have a converter to get down to maximum 3.6V. 

On the DK system OFF current should be less than 2uA. There could be an issue with your measurement. Please check try to use battery as the power supply as USB supply may create noise. 

[Freldic_SK]

The problem was solved by reinstalling the entire SDK. The current consumption is now 5 µA, and everything is working as it should. Thank you!

[Hung Bui]

Hi Peter, 
Good to hear. But 5uA is slightly on the high side. So you need to double check and compare to the DK. Make sure you are not connecting 4V directly to VDD. It should be on VDDH.