I was disappointed to see a drop off in my zone minutes in recent days, despite my exercises staying fairly consistent. It's super frustrating, especially as a numbers junkie. I've been averaging 83 zone minutes a day this year and yesterday I had 5, with no improvements this morning.
The lack of consistency is so frustrating, but my career 64.9 million steps likely means that I'm not going anywhere. The battery life is holding me to the Sense 2 as well...