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My 5555 did the same thing about a year ago. I pulled out the SD and if you look there will be small contact points on the metal pins of the card itself. Take a soft pencil eraser and clean those contact points off. This worked on mine.
I was having this problem all the time (i.e., sd card not recognized), and SanDisk told me to frequently back up my sd cards and re-format them in a card reader attached to desktop pc. THis seems to keep them as good as new. By the way, the SanDisk sd cards have a long warranty period, so if one stops working, it's a good idea to give them a call. They replaced one of mine which had lost the tiny gray tab on the side (causing it to lock).