Strange one this.
All of a sudden my Lexar and Sandisk cards have stopped working with the XT3. When I turn the cameda on it says memory full, even though I have formatted them both on a computer and in camera. That's 5 cards, only a old PNY card works. What gets me is yesterday I had no issues, today it pops up.
I have even reset the camera to factory hoping that might clear it.
Any ideas on why this might have happened?