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Corrupt fit file - Why do these happen?

This is really annoying. 

Occasionally, my Fenix 6x pro (sapphire) will fail to save an activity.

For me, this is a big problem since I can't trust it and always need a backup for important events.

I'm attaching a failed save from yesterday, in case anyone can help me repair it, but it seems to be too small to have all the data for a 3 hour hike.

file: https://www.dropbox.com/s/3f0vpl0a4ygsroh/2021-12-28-12-30-00.fit?dl=0

Any other way I can recover failed activities?

Thanks!