It looks like the SD card was full or not being read correctly. If it is being used for memory extension just make sure it does not have any back up files of the ewon or other files for configuration.
I do notice this in the log though.
pla-Switch monitoring (counters fix here)
This usually mean there is something causing interference with communication. This could be caused by new machinery being installed creating an em field or the Ethernet cable not being shielded and being close to something with high power.
As I mentioned though I would atleast update the firmware since it fixes some errors and gives updated error codes.