Sounds like a dying SD card to me.
You should already have this solved by logic. You swapped steam decks and it's still doing this, and you've seen virtually no one ever complain about this with their steam decks.
It's the card. If you haven't already, I would give reformatting it a try. If it ever does it again after that, throw it away.
Unfortunately a brand new card and steam deck later I'm still having the issue. Seems there's more to it than that
Did you buy the same card? What card did you buy and where are you buying them from? Your issue isn't common so it being the same for you with two sets of hardware is crazy. SD has had lots of bugs and issues, but having an uncommon one twice in a row is something else.
When the card doesn't mount properly, how does it show up in desktop mode?
I had a different SD card issue where the deck was automounting my sdcard at a different mount point, which was preventing it from seeing any of the installed games. Ultimately I just changed my mount points/library locations to match how the Deck wanted everything mounted.
This is a known issue according to steam deck discussion page. I get a this issue too from time to time and a restart solves it.
Steam Deck
A place to discuss and support all things Steam Deck.
Replacement for r/steamdeck_linux.
As Lemmy doesn't have flairs yet, you can use these prefixes to indicate what type of post you have made, eg:
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The following is a list of suggested flairs:
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