No, a bit scattered but my personal memory seems to work for me.

I was shooting a pic experiment and noticed after a couple of shots new images were black, not there.  Then I got a message on the LCD, "This card cannot be used".  That was a first for me.  Glad to have saved the images taken a few days prior!

The contacts cannot be cleaned..CF card, not an SD.   I suspect the card has expired, even with no expiration date.

Has this happened to you?  These little flash memory things seem so reliable..then wham.