Hi @JimmyDog given the age, more than likely the battery is failing. You can try restarting the Fitbit, but three years is a good life for something used daily. Most of mine make it around the two year mark before I get a new Fitbit.
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Good to see you participating in the community @JimmyDog.
Thanks for sharing the comment about the situation with your tracker.
In addition to what was said by @Odyssey13, it's important to know the tips suggested in this article regarding the duration of the battery.