asmallsol

I am having this issue with my garmin. Yesterday I am on a ride, and I look down to check my normal data, and my garmin is off. I think thats weird, thinking maybe my battery had died, but I had charged it that night, and when I turned it on, it had plenty of juice left. I kinda just forgot about it and kept riding. Well today, it did the exact same thing. In addition, when I load it up to Motion Based, the stats are off by a bit. Yesterday it was off by about 15 miles, today 3. And I know for a fact the distances of these rides because in the past my garmin would read much higher, and the same route taken early this year before I had this thing, my cats eye agreed. I am running the most up to date software. Any one with a few words of wisdom.