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Fitbit Troubleshooting For Six Common Problems - Lifewire
The most common Fitbit problems and how to fix them
8 Common Fitbit Problems and How to Fix Them - Make Tech Easier
Fitbit Help Center - Google Help
Why won't my Fitbit device sync? - Fitbit Help Center - Google Help
9 Fitbit Problems and Fixes: A Simplified Troubleshooting Guide