Failure to read some or all pictures or videos, computer failing to recognize or read all or partial contents of the card, being asked to fix or format in the camera or computer, being unable to save pictures or videos to memory card even if there is still lots of space left. Corrupted files. Pictures show only partly, other part is gray, black or trash. These are all signs of a failing memory card. The only solution is to throw the memory card away. Replace it with a new one.
If you want to recover files from the memory card and are unable to, the best solution is to pay someone from a computer shop to do recovery services for you. Make sure the pictures you are trying to recover are worth the trouble and money.
Now you know!