I think I know why that MicroSD Express card stopped working. It's cause I dropped it. Whats crazy is I was sitting down...and it fell on carpet. Seriously wtf. These bytches are fragile.
from IGN
"How long will a MicroSD Express card last?
Just like any SD card, MicroSD Express cards aren’t meant to be used for long-term data storage, and so they have a shelf life. How long they’ll last depends largely on the environment it's being used in, and whether or not you’re dropping it. I wouldn’t expect a MicroSD Express card to last more than 5-10 years before it needs to be replaced, so be sure to keep anything important backed up."
The Switch 2 needs a new type of SD card to expand storage, the microSD Express card.
www.ign.com