Charge 3 randomly not automatically tracking activities.

[harperj]

Today, I rode my bike down to a destination (6.2 km, 19 minutes) - Charge 3 tracked my activity, no problem. But, when I returned (by bike, uphill, lots more work and time) the Charge 3 did not track that activity. This seems to happen quite randomly, some days it will track a second activity, some days not. Is there anything I can do to ensure that it tracks?

[Rich_Laue]

is there anything I can do? 

Yes, @harperj use the manual mode found on the watch. 

On days the ride isn't auto detected, did you have any long periods of not riding during ride? 

[harperj]

my problem is that I prefer the auto detect, because it calculates the
calories and the level of cardio activity from my heart rate.

Today my Charge 3 recorded the first bike ride, but not the second one,
which started about 5 minutes after the first one ended. I didn't have a
significant gap and in the past, my Charge 3 might have recorded the two
rides as one. Very confusing!

[Rich_Laue]

Using the manual mode will also calculate calories and cordial level, but will also add distance and speed along with a map of the ride.