DJI Drone Write Failure - Extreme Pro SD

I’ve had a 64 G Extreme Pro SD card in my Mavic Air for just over 2 years, without any issues. Recently, I shot a few videos in 4K, and everything seemed normal, the flight control software showed video recording in progress, and there was no indication of a problem.

When I put the SD card into the reader slot in my laptop, everything seemed like it should be, EXCEPT the video files, DJI_???.MP4, were not there. I thought I may have deleted them, so I ran an undelete utility and the files weren’t there. It’s as if they were never written, yet the recording indicator in the flight control software showed the video timer running.

I turned on the drone, and was able to record and play back a 4K video file, so all -seems- OK.

Perhaps the most interesting part is that a data file that DJI records for all videos WAS present on the card. DJI hasn’t been very helpful, and just tells me to reset the camera and reformat the card.

MY QUESTION FOR THIS GROUP…

I can’t understand how the DJI software could show recording in progress, when there was no recording being created.
I don’t know the details of the interface between the DJI and the memory card, but wouldn’t the SD card send an indication that the write had failed? A total of 3 recordings in a row failed, but next one went through OK.

Any observations would be appreciated. Thanks!