Your micro SD card. Is it fake?
The packaging on SD cards can make it difficult to distinguish a fake SD card from the real thing.
I used this app when i bought my sdcard and it worked 100%SD insight
SD insight is a free app to view SD card manufacturing details.
See information such as manufacturer name and date, product name and serial number and validation of the SD Card.How SD insight works
==>>Insert your SD card into your Android phone
==>Launch the SD Insight application. In seconds your SDcard information is displayed.
==>You can see information such as manufacturer name, date of manufacture, and the product name and serial number. Click the button that looks like an eye to view detailed information about your card.
If you check your SD card and it shows"SD CARD IS INVALID"
it means it's a fake card. Backup ur files because it would crash anytime.
Download SD insight form here