'esp-idf esp32 spiffs suddenly failed

what can cause spiffs suddenly failed in esp-idf? It was ok during start up. Until certain time it failed. After reboot again it become ok again.

Failed mean when I try to open the file for read it return null.

FILE* f = fopen(filePath, "r");
if (f == NULL)
{
    ESP_LOGE(TAG, "Failed to open file for reading");
    return;
}

Thanks

esp32 esp-idf spiffs

Sources

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