@Mady: Can you try pressing the Volume Down and Power buttons together until the S9 restarts, as this will refresh the software and address any temporary issues that might be a contributing factor. If the issue persists, restart the phone in Safe Mode and monitor the performance for a few hours. If the issue is not present in Safe Mode, restart the phone as you would normally and delete any recently installed 3rd party applications.
To access Safe Mode, press and hold the Power button until the 'Power off' prompt appears on the screen then release > Touch and hold Power off until the 'Safe mode' prompt appears then release > To confirm, tap Safe mode > With Safe Mode enabled, ensure Airplane Mode is turned off.
