AT commands fail on nrf91 modem on 50% of custom boards

Hi,

I am using nrf9151 as a modem running SLM. When SLM comes up, it throws this error. This is a new board run and 50% of the boards show this issue. 

*** Booting nRF Connect SDK v3.1.1-e2a97fe2578a ***
*** Using Zephyr OS v4.1.99-ff8f0c579eeb ***
[00:00:00.253,631] <inf> at_cmd_custom: Custom AT commands enabled with 64 entries.
[00:00:00.253,692] <inf> slm: === SLM Starting ===
[00:00:00.261,260] <inf> fs_nvs: 2 Sectors of 4096 bytes
[00:00:00.261,260] <inf> fs_nvs: alloc wra: 0, fe8
[00:00:00.261,291] <inf> fs_nvs: data wra: 0, 0
[00:00:00.261,352] <inf> slm: SLM settings initialized
[00:00:00.261,352] <inf> slm: Initializing modem library...
[00:00:00.523,101] <inf> slm: lib_modem init: 0
[00:00:00.523,223] <inf> mcuboot_util: Image index: 0, Swap type: none
[00:00:00.523,223] <inf> slm: Serial LTE Modem
[00:00:00.523,315] <inf> slm_uart_handler: UART baud: 115200 d/p/s-bits: 3/0/1 HWFC: 0
[00:00:00.531,677] <err> nrf_cloud_client_id: Failed to get device UUID: -8
[00:00:00.531,677] <err> nrf_cloud_client_id: Failed to initialize client ID, error: -8
[00:00:00.531,707] <err> nrf_cloud_transport: Failed to get client ID, error -5
[00:00:00.531,707] <err> slm_nrfcloud: Cloud could not be initialized, error: -5
[00:00:00.531,738] <err> slm_at: nRF Cloud could not be initialized: -5
[00:00:00.531,829] <inf> slm_at_host: at_host init done

I appreciate there may be a couple of things that could be the cause of this issue. I would like any suggestions of what to check. 

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