Thank youSad to say but this is the time to buy a new one or if it's still under the warranty period you can contact the manufacturer.
Hirap ah. 64gb pa naman.sakit talaga ng sandisk yan, yung saken ganyan din ang problema, usb stick naman siya ilang beses ko na ni reformat at ni repair using official sandisk repair tool ganon pa din
bili na lang ng bago