I am having problems with my SD cards for my trail cameras. I now have 3 cards that say memory card error, card locked and yes I have checked the little lock on the side. That it not the problem. The first cards it happened to (Kingston 2GB) was on my Scout guard and now I just checked my moultrie(PNY premium 4GB) and have one that says it now too. I use my lab top and camera to look at the pics and to erase my pics. Is there anything I can do to fix the cards and what do you think is causing the problem?