S pen z fold 3 edition stop working properly since the latest update

[AlphaHotel]

It's strange the digitizer works on some parts of the screen

[BandOfBrothers]

If the following troubleshooting steps do not work @AlphaHotel then I'd suggest to contact Samsung to arrange to send the phone to them, or if local make an appointment at a Samsung Service Centre. 

• 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. 
• 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 or use a Tv's USB Port 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. 
• Factory Reset after backing up if it'll let you. 

If I can be of any further help then please don't hesitate. Take care.  😎