One thing I do now that has eliminated pretty much all my camera issues is run the same card in the same camera. I number all my cameras and number all my cards. Card 1 and always and only run in Camera 1, etc. Each time a card is put into a new camera it is formatted. Sometimes this jacks up cards and they wont capture or store pictures. I have zero issues now with pictures. I also do not run cards in different computers/tablets. Never mix a Mac with a PC when viewing the cards.