i also have same issue, purchased on 22 July & been using it since.
suddenly 3 days ago the sd card not detected in my phone, i put it on card reader also not detected by my pc…
previuosly been purchased the 16 gb for my galaxy note 2 and working well not any single issue happen, then purchase another one for my redmi 1s & the problem appears,
the online store that 1 purchased this sd card says that i need to provide the box for warranty claim…
i dont have the box due its already 3 months ago & no mention earlier that i need to provide the box for warranty claim…
been emailing also to support but no answer till now…
