Not able to read SD card

Hey All,

I've got a Samsung Galaxy Prime SM-G530FZ
Running Android 5.0.2
With KNOX 2.4 installed

The phone has been running fine for a while, apart from an issue where if I restart it goes into Set Warranty: Recovery Mode. And I have to boot manually. No big deal. Thats not the issue.

Today, it just started to play up and stayed black like it had no battery left. Yet there was over 50%. It kept telling me "Touch Wiz has closed". It has done that on every start up, but comes back and...

Not able to read SD card

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