Sd card not working

I recently bought a 8gb sandisk sd hc memory card. It was working fine at first, but after a few days it stopped working. I inserted it in an another phone, but still not working. Both the devices are not detecting the card. I am using a Samsung galaxy grand prime+ running on marshmallow. And i am pretty sure that it is a genuine product. It came with sealed genuine packing.
Is my phone responsible for this or is it because of any other reason ?

Please tell me a solution.
Thank you

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