This may occur if the number of screen wake-up times increases when you raise your wrist in special scenarios.

The power consumption of your watch may increase when you enable Auto heart rate monitoring.

To reduce the battery consumption of your watch: 

• Disable Continuous heart rate monitoring in the Noisefit Sport app. You can do the same by Swiping to the right on the watch from the homescreen and turning off automatic heart rate montoring.
• Disable Notifications in the NoiseFit Sport app if you do not need the notification function.
• Disable Raise wrist to wake screen in the NosieFit Sport app if you do not need to use this function.You can do the same by Swiping to the right on the watch from the homescreen and turning off Raise to wake up Function