How to decrease current consumption in sleep at nrf v1.3.0 tag?

I could decrease current consumption at v1.2.0, but couldn't at 1.3.0. 520uA flows in k_cpu_idle(); 

How can you do that?

Also, in v1.3.0, CONFIG_UART_0_NRF_UARTE is depricated. How can you disable UART 0 in prj.conf?

Any tip? Thanks

<environment>
- Windows10
- DK v0.9.0
- modem fw v1.2.0
- nrf v1.3.0
- Segger IDE 4.52

<prj.conf>

# General config
CONFIG_ASSERT=y

# Network
CONFIG_NETWORKING=y
CONFIG_NET_NATIVE=n
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_OFFLOAD=y

# BSD library
CONFIG_BSD_LIBRARY=y

# AT host library
CONFIG_AT_HOST_LIBRARY=n
CONFIG_UART_INTERRUPT_DRIVEN=n

# Stacks and heaps
CONFIG_MAIN_STACK_SIZE=3072
CONFIG_HEAP_MEM_POOL_SIZE=16384

<main.c>

/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
 */

#include <zephyr.h>
#include <stdio.h>
#include <drivers/uart.h>
#include <string.h>

/**@brief Recoverable BSD library error. */
void bsd_recoverable_error_handler(uint32_t err)
{
	printk("bsdlib recoverable error: %u\n", err);
}

void disable_uart0(){
	NRF_UARTE0->TASKS_STOPTX = 1;
	while(NRF_UARTE0->EVENTS_TXSTOPPED == 0);
	NRF_UARTE0->EVENTS_TXSTOPPED = 0;
	
	NRF_UARTE0->TASKS_STOPRX = 1;
	while(NRF_UARTE0->EVENTS_RXTO == 0);
	NRF_UARTE0->EVENTS_RXTO = 0;
	
	NRF_UARTE0->ENABLE = 0;
}

void main(void)
{
    disable_uart0();
    k_cpu_idle();

}

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