I enjoy using the SPH Graph on my Garmin 830. Unfortunately, periodically the display changes by itself. For example, I always have the main display set to speed. From time to time and mid-ride, this display will suddenly change to something else - either HR or power. When I get home and connect to Garmin Connect I check the SPH Graph and find the code for the display has changed accordingly. Does anyone have any ideas as to how this happens. Is there a fix?
