So a few weeks ago, I went to format a SD card and it came up reading “may be corrupt”, ok cool, I grabbed another card, formatted and shot not problem. I’ve been doing sessions since and not had any further problems with cards. Tonight, I was finishing up my session, and they wanted on last shot, when “pressing the button”, the camera would not fire and said “card error”. Obviously i panicked and pulled the card, put in another card and still same error. Luckily I always carry a back up camera so I started shooting with it. Finished up session, SPED home, and uploaded card and all the images are there. So my question is .... what is going on ??? any insight?