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SD Card contents blanking out


New Member
I have had a very frustrating experience with my sd card on my spro.
I copy files from C: to SD card, use files for weeks, then battery drains out and unit does full power off. I then charge up and power back on, those files are gone. No trace of them on the SD card. Other files remain. some of the folder structures are there i created manually, but the copied content is just gone, despite having directly used some of those very files post copy.

Google searches have been of no help, and before I go and blow another $40+ on a 64gb chip to test if its a bad chip wanted to inquire for thoughts suggestions on troubleshooting this.
Info on the chip: Adata-64GB-Class-10-Micro-sd-card could get more details if needed