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Code getting restarted after getting error as FR_DISK_ERR

Hi,

I am working on interfacing SD card with nrf52. I am sampling SAADC at 1000 sps and trying to write over SD card as well as sending over BLE. Both operations are working fine but after FR_DISK_ERR , entire code gets restarted. There is no periodic occurrence of this error. It occurs randomly. Documentation of FR_DISK_ERR says it is unrecoverable error.

Does anyone faced this problem previously?

Sometimes in debug mode code gets stopped at memory location 0x1e054...shown below code_stopped_at.JPG

What could be the issue?

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