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A frequent cause for damage to memory cards:
There is for it a technical term electrostatic discharge shortened ESD. From triboelectricity results a spark, which produces a short current pulse. If this current pulse meets on a construction unit in the memory chip, the outcome is a hole on a very thin oxide coating, a memory cell is destroyed. Damages leave a recess and lead possibly later to a loss.
Memory cards are in such a way designed that approx. 10,000 V of ESD do not cause damage. But, there are situations with those develops by triboelectricity up to 30,000 V, e.g. with the course over an artificial fiber carpet in low air humidity. Affect therefore your memory card never at the metallic contacts or simply do not take out your card from the camera and transfer the pictures with the camera, however the risk of a total loss reduces substantially.