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Hello @Dnbmom75, thanks for joining us, it's great to see new faces around! 
Is your app closing itself when you're syncing or is it not finishing the sync process? If it's closing itself, please restart your phone and open the app once again. If it's not finishing syncing with your tracker, I would like to suggest checking @HelenaFitbit's excellent tips and recommendations that have been proven very helpful for many members in the Community.
However, in case these steps don't seem to work for you, my recommendation would be setting up your tracker as a new device to reset the connection between your tracker and your phone. Don't worry, the information previously stored in your account won't get deleted.
To set up your tracker as a new device:
- Open the Fitbit app and tap on the Account tab at the bottom of the screen, then tap on "Set up a New Device"
- Choose your tracker and follow the onscreen instructions to continue
- When the app asks you to replace your current tracker, please replace it and continue with the process.
I hope this can be helpful, give it a try and keep me posted in case you need anything else!
Best Answer