Hi Loungefrog.
_ _
_ Dear member of SanDisk Community, welcome. _
Please, try the card in other laptops, direct to it’s port-card, with a good adapter, non generic (Not a card reader, eye).
If you have a Mac, and have to use a “card reader” , use only of brand recognized and high quality.
_Luck, and then you tell us, what happened, please.
Regards, Alfred. (Google translated)_
PS: “jo namo” signifies in Lithuanian language, “your home.”