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Hello @shodge, let me start by giving you a warm welcome to the Fitbit Community. I'm wondering if you are using the exercise shortcut of your Charge 2? If you do, since this require to use the connected GPS feature make sure your phone can maintain a constant connection with your tracker.
So I recommend to review if your phone can identify your location and can track your location when you're not using Wi-Fi. Also make sure the Fitbit app is open on your phone or running in the background. Do not force quit the Fitbit app and make sure your phone is compatible with this feature. To see the latest list of supported devices, please go to http://www.fitbit.com/devices.
If you're still having difficulty, try these troubleshooting steps:
Hope this get you back on track. See you around!
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