If your Garmin Fenix 5 doesn't react anymore and the display seems to be frozen, then it makes sense to reset the Smartwatch.
This means that the Garmin Fenix 5 will be restarted with a soft reset. All previously saved data is retained.
To restart the Garmin Fenix 5 using Soft Reset, please proceed as follows:
Restart Garmin Fenix 5 using Soft Reset
1. Press and hold the "Light" button for at least 25 seconds. Your Garmin Fenix 5 will now be switched off
2. Then press and hold the "Light" button for one second to switch on the Smartwatch.
You now know how to proceed if your Garmin Fenix 5 no longer responds, the screen is frozen and the keys no longer work (software-dependent).