Why do I get sd card unexpectedly removed error in my Samsung Galaxy S4 16GB ?

A

AC Question

This has been occuring past few days. It occurs frequently and as a result my phone restarts and get's heated up. Is there any error in my sd card slot ? Or has my sd card got corrupt after a use for 2 years.
I don't know what's wrong with it. Can anyone please tell me what to do ? It's Sandisk 8GB sd card. Shall I buy a new sd card or format the old one and try it out once ?
 

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