Usually, our Fitbit devices work without any problems, but occasionally they start acting in unusual ways, from not regularly syncing to not responding.

Frequently reported issues with Fitbits include things like:
Not turning on after fully charging.
Fitbit app stuck in looking for the device.
Bluetooth connection not working between Fitbit and phone.
Slow or sluggish performance.
Won’t respond to button presses, taps, or swipes on-screen.
Not tracking activity, like steps and other fitness data.
Won’t sync or can’t completely sync.
If your Fitbit shows these signs and symptoms, one of the best (and simple) fixes for your Fitbit device is a restart and/or a reset!

https://crgsoft.com/what-to-do-if-the-fitbit-ionic-does-not-turn-on/
Fitbit stuck on looking, searching, or no device found? Here is how to fix it
Cancel Fitbit Premium or Coach using your iPhone, Android, computer, or the web
How to turn off ‘tap to wake’ on the Fitbit Versa
How do I turn off and shut down my Fitbit?
Fitbit Versa Not Charging? Here’s What You Should Know
Fitbit Versa not syncing, here’s what you can do



Restart or reset your Fitbit? What’s the difference?
Although some use these terms interchangeably, there is a significant difference:

Restarting your Fitbit turns it off and on without deleting any activity data.
Resetting your Fitbit wipes all the data from your device and turns it off and back on. This procedure is also called a factory reset.
While it’s usually easy to restart your Fitbit, resetting involves more steps.

How to restart your Fitbit by model
Restarting a Fitbit device often means paying particular attention to the charging pins and sensors.

Gold charging contacts on back of Fitbit
Inspire HR Fitbit sensors




Never insert anything into these holes outside of the directions. Inserting items like paper clips, tools, and such will likely damage your Fitbit permanently.

Restart a Fitbit Sense series, Versa series, Ionic, or Blazerestart your Fitbit Versa 2
For the Fitbit Sense series, Versa 2 and above, hold the side button for at least 10 seconds until you see the Fitbit logo on the screen, and then release the button.
For older models like the original Versa, Blaze, or Ionic, press and hold the back and bottom buttons until you see the Fitbit logo on the screen. Then release the buttons.Fitbit Versa, Ionic, and Blaze restart process