Sounds like it’s defective to me. You should return it to where you bought it from for a refund or exchange, or if not possible contact SanDisk directly for a warranty replacement.
Btw, you posted this in a board dedicated to The SanDisk Ultra Plus SSD (Solid-State Drive) board. You have a memory card. If you have any other questions or problems relating to memory cards, you should post them here instead. 
