Micro HC 32GB keeps mounting and unmounting in phone!!!

Hi all,

I have a Micro HC32GB in my Samsung J3e phone. 

Lately it has started unmounting, and mounting. It does it about a dozen times a day now. So i have taken it out of the phone for now.

Any thoughts?

Its numbers are

MMB3R08BUACA-GE

XJ8B20150715