Date time synchronization fails after nRF Connect SDK and modem firmware update - yet again

Dear Nordic Support Team,

After I updated the nRF Connect SDK (1.5.1 to 1.6.1) and the Modem firmware (1.2.3 to 1.3.0) on my nrf9160 DK device (v1.0.0, SiP revision 2), the date time isn't synchronized anymore. The date time library only issues the DATE_TIME_NOT_OPTAINED event. This issue might be related to this ticket.

I followed these instructions to update the modem firmware.

Here are the crucial code snippets I use:

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// Modem initialization
int lmModem_initialize(const LmModemConfiguration config)
{
int error;
error = lte_lc_init();
if (error) goto onError;
error = lte_lc_psm_req(config.requestPsm);
if (error) goto onError;
error = lte_lc_connect();
if (error) goto onError;
k_sleep(K_SECONDS(5));
return LMMODULSUCCESS;
onError:
return LMMODULERROR;
}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

This is my prj.conf:

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# Physical interface
#==============================================================================
CONFIG_GPIO=y
CONFIG_SERIAL=y
# UART (depends on SERIAL)
#==============================================================================
CONFIG_UART_ASYNC_API=y
# Include reboot functionality
#==============================================================================
CONFIG_REBOOT=y
# Logging
#==============================================================================
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Please note that I have a second, older device (v0.9.0, SiP revision 1) which still holds the old modem firmware version 1.2.3. The very same code (compiled with the 1.6.1 SDK as well) runs flawless on this device.

Can you please tell me what causes the issue? Since this is the second time my v1.0.0 device shows issue with the date time synchronization after a modem firmware update and no one else seems to have reported similar issues, do you think my hardware might be broken?

Thank you for you help!

Sebastian