Do you have a screen protector and or a privacy screen protector fitted @skyfullofstars ?
If not run the diagnostic tool in your Samsung Members app.
And just as a process of elimination try > Clear Cache Files from the phone's System Partition Section > https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/ You may need to insert your earphones or hook upto a powered On Laptop to access the Clear Partition Section. This may help with lag or stutters as this clears the phone of old/unused or broken cache files.There is also a Repair Apps option in the Menu System too. And Safe Mode > https://www.samsung.com/uk/support/mobile-devices/how-to-start-my-galaxy-device-in-safe-mode/ turns off downloaded apps and themes etc which may highlight an app or theme that's causing conflict.
A Samsung Service Centre can assess your phone too.
Samsung > What-to-do-if-your-galaxy-phones-touch-screen-doesnt-work-properly/
Samsung > How-to-fix-an-unresponsive-touchscreen-on-a-galaxy-device.
If I can be of any further help then please don't hesitate. Take care. 😎
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "
