Hello @SunsetRunner thanks for bringing this to my attention, welcome to our Community Forums! I'm here to help you with your heart rate concern.
Let me share with you that occasionally the Fitbit can have difficulty finding a signal, typically due to the tracker's fit. For example, wearing your band tightly may constrict blood flow in your wrist and affect the signal. I also recommend experimenting with how high you place the tracker on your wrist. When you're not exercising, wearing the tracker just above the wrist bone--as you would a watch--typically works fine. However, moving the tracker up a couple inches can be helpful during high-intensity exercises or exercises that cause you to bend your wrist frequently. If you haven't already done so, please review our recommendations for wear and other tips here and let me know how it goes.
Keep me posted, I'll be here if you need anything else.
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