I am doing a long term study, leaving the moths out for 2 weeks and changing the SD cards when I have calculated that they will fill up. For my last deployment, I fully formatted the SD cards (Magix brand) and double checked that they were clear. I had had not issues with these SD cards the first time they were deployed. However, some of the SD cards only wrote the first 2 days, and others only wrote the first day. When I got to the moths, they were flashing green and red simultaneously, implying SD card issues.
It is maybe the fault of my study design that I change the cards so irregularly, but given these SD cards worked perfectly the first round, and were definitely formatted and configured correctly (ExFAT), I'm struggling to understand what went wrong.
Not being able to identify the problem means I am not sure how to fix it, and I don't want to lose anymore data
TIA!