@MarcBas Welcome to the Community Forums.
Thanks for taking the time to share what you've experienced with your Fitbit Ionic. If you haven't done so, I suggest performing a restart, following the instructions here. If the issue persists, I suggest trying the following:
Important: Please note that you'll need to reinstall any apps on your device after the reset, and if you couldn’t sync your device, then any data on the Fitbit device will be lost.
On the device, hold all three buttons for about 10 to 12 seconds.
When the Fitbit logo disappears, quickly release the bottom right button, continuing to hold down the left and top right buttons (releasing the bottom right button as soon as the logo disappears is time sensitive).
When the device vibrates, release all buttons.
Wait for approximately 1-2 minutes while the device clears all data. Eventually, the Fitbit logo appears and the device boots and displays fitbit.com/global/us/setup
When the device successfully resets, please set up your Ionic as new device. See How do I set up my Fitbit device?
On a side note, I've moved your post to this thread so we can keep our forums organized.
Hope this helps.
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