2 Simultaneous SD Card Failures In 2 Separate Cameras? Any Ideas?

Client was checking video today and pulled the SD cards from two different Axis cameras and found both SD cards asked to be formatted before use. They weren't just blank - it was like they had just come out of the package.

I checked the cards when they were installed and video had recorded. The client maintains he's checked the cards in the past and they had video clips on them so its not like we put in unformated cards. Both cards were new two months ago (SanDisk Ultra 64 GB). The cameras were on a local dedicated network. There was a power outage 3 weeks back but no one in the building complained about any computer or electronic issues (other than resetting their deck clocks and micowaves).

Any ideas?

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