FR945 Crash/restart when saving activity

Yesterday I participated in a relay trail race and for leg 2 of 3 my forerunner crashed when trying to save the activity and restarted.  After restart the activity was not available on the watch. I have connected the watch to my laptop and there is not a FIT file on the watch.  I was looking in GARMIN > Activity for the file.  My other legs of the race are saved in that folder, so I think I'm looking in the right place.

Anything else I can do to retreive my missing race data?  And how do I prevent this from happening again in the future?