I have been using the Generation 2 RFID circuit boards for about a year now. I deployed the boards last winter/spring for data collection, brought them in from the field in late July to clean them up, make repairs and store them until this fall. When I went to deploy the circuit boards again just recently, I have been getting an error message with some boards saying "SD card is write protected" whenever I try to re-program the clock settings, id and on/off schedule. After receiving the error message, it flashes a message saying "began logging data on 01/01/01 00:00:00" and no data is recorded on the cards.
I have checked that the "switch" on the side of the cards is not in the lock position, and have tried with both old and new (never used) SD cards (from Mouser Electronics, INC) and get the same error message. The cards have also been cleared of any data files previously stored on them. The only thing that has changed from last winter is that the readers have been inactive for a few months. Batteries are fully charged.
I was wondering if anyone else has had similar experiences? Would this be a card problem or a circuit board problem? Any suggestions or advice would be greatly appreciated.