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i have this issue with a sandisk 32gb class 10 sdcard and one day it just gave up (even my pc cant read or reformat the sdcard), i bring it back to the store to claim warranty (fortunately sandisk got lifetime or 10yrs warranty on the sandisk ultra products) and got a new one. so it turns out its a bad/broken sdcard, at least in my case.

did same thing i did with the first one when i got it, format from the phone then use.

goodluck with yours
 
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My note 2 everyday has a message come up that days "SD card unexpectly removed" and then says "SD card is being reinstalled" but It happens everyday and my SD card hasn't moved, WHY is it doing this???

Make sure you back up everything on the SD card. Had that happen with two 32gb Sandisk cards and both failed after a week of those messages.
 
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