Failure to eject may be a
first warning of imminent SD failure.
I had a
always was ejected card that always had the 'fix' error when inserting (and nothing usually found). All at once, while writing books: DEAD STOP.

That card no longer works in any system
Another failure to eject (using the systems: eject) is something is still accessing the card. Write behind cache,
Indexing, A/V scan, other device utility (Sony?), a blue moon