Hi all, first-time poster here. Also having issues with "SD card unexpectedly removed" and then immediately remounted. Didn't have problems when phone was new (5-6 weeks ago), but now it seems to be getting worse and worse. Galaxy S4, PNY 16 MB class 10 micro SD card.
Call me crazy, but... I was convinced this was not a mechanical problem (pulling card out, blowing in slot (a la NES), cleaning contacts, etc) didn't seem to make a difference.
But I was just playing around a bit more with the phone. I actually had the back cover *off* with the phone on. Lightly pressing down on the SD card (in the middle of the card, or at the contacts, or wherever) was giving me this "SD card unexpectedly removed" error. As soon as I let go, the SD card was found again. Every time, 20 out of 20 times.
I tried stuffing a piece of index card (cut down to the right size) in the slot between the SD card and that outer metal/blue-tape piece of the slot to see if that would create a better electrical contact between SD card and phone. That made no difference. *But*, when I put the index card on the under-side of the SD card (between the SD card and the phone, careful to not insert the paper too far as to block electrical contacts), this seemed to fix the problem. I'm unable to get the "unexpectedly removed" message anymore (for the last hour, at least). (Easier to insert the index card if you remove the SD card and then put both (index card/SD card sandwich) in together.)
Can anyone else with this issue see if they can reproduce what I've said here? Was the solder job too weak in the manufacturing of this phone? Or do I happen to just have a completely different problem (mechanical contacts, vs everyone else with a software bug)?? Will update if I get this "unexpectedly removed" error again...
Cheers,
Mike