C030-R412m: in rare cases, the application disappears in ROM.

[phlegx]

Description of defect

I have a bootloader like described here and a working application (threads, GNSS, MQTT over SIM Internet, etc.) running on the target. In very rare cases, the application disappears in ROM after randomly long time. After target restart (reset button or power re-attach), the bootloader starts (bootloader output in console) but not the application. It seams that the application is away (erased, no output trace on console). Can anyone tell me how this can happen?

Here my target overrides:

"target_overrides": {
        "*": {
            "rtos.idle-thread-stack-size": 512,
            "rtos.main-thread-stack-size": 8192,
            "rtos.thread-stack-size": 5120,
            "rtos.timer-thread-stack-size": 768,
            "mbed-trace.enable": true,
            ...some network configs
        },
        "UBLOX_C030_R412M": {
            "target.features_add": ["STORAGE"],
            "target.components_add": ["SD", "FLASHIAP"],
            "target.network-default-interface-type": "CELLULAR",
            "target.bootloader_img": "bootloader/w-bootloader.bin",
            "storage.storage_type": "TDB_INTERNAL",
            "sd.SPI_MOSI": "SPI_MOSI",
            "sd.SPI_MISO": "SPI_MISO",
            "sd.SPI_CLK": "SPI_CLK",
            "sd.SPI_CS": "SPI_NSS"
        }
    }

Target(s) affected by this defect ?

C030-R412m

Toolchain(s) (name and version) displaying this defect ?

Mbed Studio (latest)

What version of Mbed-os are you using (tag or sha) ?

mbed-os-5.15.8

What version(s) of tools are you using. List all that apply (E.g. mbed-cli)

Mbed Studio

How is this defect reproduced ?

I cannot reproduce this defect.

[0xc0170]

cc @ARMmbed/team-ublox