Garmin 840 Solar dropped ride. No data saved in history.

I have an issue when I stop my ride, enter food and water intake, RPE, and then hit save; the Garmin screen goes into a "start-up mode" where it says Garmin and everything else is blank. When the screen reappears, there is no ride data, nothing saved to history or anything. 

This worries me because I have already lost significant ride data. Has anyone heard anything about this happening?