USB stick SanDisk Ultra Flair 32GB 3.0

My usb stick, after using it some times, now it seems empty but the storage is as full as it could due to the data i had inside. 

What can i do to find my data again?

I used it in 2 pc systems, and in usb 2.0 and usb 3.0 ports. The problem was the same . 

At a Comand Prompt what does:

dir G:

show?  And what does:

attrib G:/*.*


I got a same issue. How can i solve the problem? Thanks.