Exercise/Move not as responsive

It seems as though I'm not getting credit for my exercise/move as much as I used to. I run 30 minutes every day and have the same move habits. I used to hit my 610 move goal pretty easily, but haven't been able to hit it over the last 5 days. I used to get exercise time for taking the stairs and walking a little faster than normal, but now it sits on 0 minutes until I start running and then it doesn't even record a full 30 minutes when I run (usually 27-28 min). Has something changed? Anyone else experiencing this?

 

Thanks so much for your quick response. It prompted me to google "apple watch heart rate monitor" and I found this:
http://www.theverge.com/2015/5/21/8640803/apple-watch-heart-rate-monitor-less-reliable-after-update

I checked my Health app and realized there are 1-2 hr gaps when my heart rate isn't being checked as a result of this bug. It's supposed to be checking my heart rate every 10 minutes. I guess we'll be getting another update to fix this soon.