Resetting during a workout

Three days in a row, I would be in the middle of a workout, sweating, crushing the next mile, and my Vivofit 4 would beep that I hit my goal, I would click the button to clear the screen to see the total elapsed time, and the device would restart, (blue Garmin triangle would appear), and it would return to the home screen with no workout currently being recorded. 

Day one it happened, I was upset - just crushed a 6 mile run on a route that I normally do with nothing to prove to it. 

Day two, went on a hike, have no idea how far because it restarted when I clicked the button. 

Day three, it happened mid way through my run (new course), and I flat out STOPPED my workout and walked home I was so upset.

Has this happened to anyone? Do i need to change the battery, i've had it about a year.

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