@Ryan-Pedersen
The error does occur after random time and it happens for a bare system solely installing the Linux system installed on the Onion-2s module. I have tested this for several modules and seems to be systemic for my boards.
It looks like the jffs2 is corrupted during kernel idle . There is no power interruption but despite of that, the operation fails.

Again, all inputs to debug this further is very welcome.

Thanks in advance