You want to avoid mixing cards between cameras, as that can cause conflicts and corrupted cards. I mark all my cards as to what camera they go in, and stick to that.
Also, always, ALWAYS, format the cards in camera after you've downloaded them.
You seem to be using high quality cards, and that's another rule I have; stick to Lexar and Sandisk cards.
With those three rules, I've never had an issue with cards in my cameras.
David Buzzard's Technical Blog