My health stats data is not syncing over to the app on my iphone. For example, my watch shows the body battery values and the day's plot of values. However, on my iphone Garmin app, when I go to Health Stats / Body Battery it simply says "Not enough data." My normal workout data including HR, respiration, GPS track, etc. all sync fine. Any ideas as to what the problem is? (BTW, I tried Garmin help via chat. I was effectively told to make sure my phone app and watch were all up to date. They are. Hence, this wasn't helpful.)