My experience has been that very often SD cards come with a file system that doesn't work at all reliably with the Gen3.
From your Windows machine, right click on the "SD Card" drive that mounts from the Gen3, select "Format", and reformat the card as FAT32. Then turn off the Gen3, take the card out, turn the Gen3 back on, and put the card back in. The Gen3 will recreate the required folders on the card and operation should (hopefully) be trouble-free from then on.
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