Restarting and resetting
If you experience problems with your device, you can try restarting it. Restarting the device will not delete any of your personal data from the device. However, when restarting, the device's date and time settings will return to the default, and any ongoing processes (such as sleep calculation) will end. After reset, the device should be synced with the app to get the correct time settings on the device.
The restart/reset button is on the top side of the device, under the wristband. To restart the device, press the button with a pin when the device is NOT plugged in to a powered USB port or a USB charger.
To reset Polar 360 to factory settings
If restarting your device didn't help, you can reset the device back to factory settings. Note that resetting the device back to factory settings empties all personal data and settings from the device, and you will need to set it up again for your personal use.
To factory reset your device, press the device's restart/reset button when the device is plugged into a powered USB port or a USB charger.
After the factory reset you need to Set up your Polar 360 again.