Hi Serpil Thank you for your asking. Kindly provide the information below so that we can better assist you. 1. Does the issue appear right after any system/apps' download or update? 2. Your current firmware version Settings>System>About Phone>Software information 3. Have you ever dropped or broken the device?
Kindly try some at-home troubleshooting tips below: 1. Please try to enter "Safe Mode". If the function works well in Safe Mode yet the issue remains out of Safe Mode, please check any disturbance from installed 3rd party apps. # How to enter and exit "Safe Mode"